Productivity questions, answered
162 short answers from 33 guides. Each set links to the full guide for the worked examples and the reasoning behind the answer.
Age, Time Cards and Time Arithmetic: How the Counting Works
Why not calculate age by dividing days by 365.25?
Dividing days by 365.25 drifts, because turning the fraction of a year back into months and days depends on which months you mean. 13,315 days gives 36.45 years. Counting birthdays, then whole months from the last birthday, then leftover days matches a paper calendar, legal age limits and how people actually celebrate.
How old is a baby born on 31 January on 28 February?
A baby born on 31 January is one month old on 28 February, or on 29 February in a leap year. When the same day number does not exist in a shorter month, the usual rule is to clamp to that month's last day. So someone born on 31 January 2025 is 1 month and 1 day old on 1 March 2025.
How do daily and weekly overtime combine?
When both a daily and a weekly overtime limit apply, count daily overtime first, then apply the weekly 40-hour limit only to the remaining straight-time hours. That way a long day is not counted as overtime twice. California, for example, starts overtime after 8 hours in a day, while the Fair Labor Standards Act sets the weekly limit.
Is time clock rounding legal?
Federal regulation 29 CFR 785.48(b) accepts recording start and stop times to the nearest 5 minutes, tenth of an hour or quarter hour, provided the practice averages out so employees are paid for all the time they actually worked. Rounding that only ever goes the employer's way, such as always rounding clock-ins forward, is not neutral and is not allowed.
What is the difference between a duration and a clock time?
A duration is an amount of time, such as 8 hours 25 minutes, while a clock time is a position on a 24-hour circle, such as 06:40. Adding a duration to a clock time wraps around midnight, so 22:30 plus 3 hours is 01:30 the next day, and 08:00 plus 50 hours is 10:00 two days later.
AI for Executive Assistants and Front Desk Staff: A Practical Playbook
What tasks can AI help executive assistants with?
AI helps executive assistants with tasks that start from information they already have: inbox triage, one-page meeting briefings, agendas with timings and owners, minutes and action lists from rough notes, travel itineraries from confirmation emails, polite declines and board pack summaries. The model arranges facts and keeps the tone right, but it guesses when asked to know something, such as whether the CEO is free.
Can front desk staff at a medical practice use ChatGPT?
A front desk at a medical, dental or therapy practice handles protected health information, and in the US HIPAA allows sharing it with a vendor only under a business associate agreement, which consumer chat apps generally do not sign. Even a name, time and appointment type reveals a patient, so write templates with placeholders and fill in names in the scheduling system.
Can AI schedule meetings across time zones?
AI can propose meeting slots across cities such as London, Chicago and Singapore, but it may get daylight saving wrong. Check any proposed time that crosses a border with a time zone converter or world clock before sending. A model also cannot see a calendar, so availability must come from the prompt or be marked for confirmation.
How should I check an AI-drafted message before sending it?
Check every name, date and time against the calendar or booking system, and recheck any time that crosses a border. Make sure fees, refunds, cancellation windows and parking details match actual policy, read the draft as the recipient, keep confidential executive content out of external replies, and fit SMS reminders into one message where possible.
How do I write a script for an upset caller with AI?
Describe the situation and the options you can offer, without the caller's name or health details, and ask the AI for a short phone script. Constrain it to acknowledge the inconvenience without blame, offer only the listed options, promise no compensation, and include lines for a raised voice and handing over to a manager.
Browser Reminders and Notes: What Survives a Closed Tab
Why do timers run slower in a background tab?
Browsers throttle timers in hidden tabs to save power. Chrome limits timers in a hidden tab to about once per second, and since Chrome 88 it applies intensive throttling to tabs hidden for five minutes or more, running chained timers about once a minute. A browser reminder in a long-hidden tab can therefore fire up to a minute late.
How do I unblock notifications for a website?
Once you block notifications, a website cannot ask for permission again, so you have to reset it yourself. Click the icon at the left of the address bar and open the site settings to change the notification permission. Also check that the browser has notification permission in the operating system settings and that Focus or Do Not Disturb modes are off.
Does an online notepad save my text automatically?
The RedBison Note Taker saves its text to the browser's localStorage a moment after you stop typing, so a refresh, a closed tab or a browser restart brings it back. The saved copy stays in one browser on one device, and clearing site data or using a private window starts empty, so download anything you need to keep.
Can a browser reminder go off when my laptop is asleep?
No. A web page can only run code while it is open, so when the tab is closed, the browser has quit or the laptop is asleep, nothing runs. When the page is reopened, any overdue reminder fires once straight away. For alarms that must fire while the laptop is shut, use a phone alarm or a calendar that syncs to it.
Cups, Grams and Shoe Sizes: Everyday Conversions That Trip People Up
How do I convert a gas mark to Fahrenheit?
Gas mark 1 is 275°F, and each mark above adds 25°F, so gas 4 is 350°F, gas 6 is 400°F and gas 9 is 475°F. Below gas mark 1 the scale halves: gas 1/2 is 250°F and gas 1/4 is 225°F. To get Celsius from Fahrenheit, use °C = (°F − 32) × 5/9.
How much lower should a fan oven be set?
A fan or convection oven is usually set about 20°C (25°F) lower than a conventional oven, because the moving hot air transfers heat faster, so a 180°C recipe becomes 160°C fan. Many recipes written in the UK give both temperatures. If results run dark, check with an inexpensive oven thermometer, since dials are often 10 to 25°F out.
How do I convert EU shoe sizes to US sizes?
Convert through foot length. Under the ISO/TS 19407 formulas, EU = 1.5 × foot length (cm) + 2 and UK adult = 3 × foot length (inches) − 23, with US men's = UK + 1 and US women's = UK + 2. A men's US 10 works back to a 27.1 cm foot, which is UK 9 and EU 42.6, sold as 42 or 43.
What is a barleycorn in shoe sizing?
A barleycorn is an old unit of one third of an inch (8.47 mm), and UK and US shoe sizes count in barleycorns, so each full size is one barleycorn longer. EU sizes count in Paris points of two thirds of a centimetre (6.67 mm), while Japan and Mondopoint (ISO 9407) simply use foot length in centimetres or millimetres.
How big is an Australian tablespoon?
An Australian tablespoon is 20 ml, a third larger than the 14.8 ml US tablespoon or 15 ml metric tablespoon. That means an Australian recipe calling for a tablespoon of baking powder means 4 teaspoons, not 3. Cups differ too: a US cup is 236.6 ml and a metric cup, used in Australia, is 250 ml.
DOCX, ODT, RTF, HTML and Markdown: What Survives a Conversion
What is inside a DOCX file?
A DOCX file is a ZIP archive of XML files defined by the Office Open XML standard, ECMA-376, also published as ISO/IEC 29500, and introduced with Word 2007. The body lives in word/document.xml, named styles in word/styles.xml, list definitions in word/numbering.xml, pictures in word/media/ and the title, author and dates in docProps/core.xml.
What is the difference between DOCX and ODT?
DOCX and ODT are both zipped XML, but they store formatting differently. DOCX, the Office Open XML format of Word, usually puts properties such as bold directly on each run of text. ODT, the OASIS OpenDocument format of LibreOffice Writer, points text at a named style, possibly through a chain of parent styles. ODT is also an ISO standard, ISO/IEC 26300.
What is an RTF file?
RTF, Rich Text Format, is a plain text file of control words that Microsoft introduced in 1987 and last revised as version 1.9.1 in 2008. A bold word looks like {\b bold} and a paragraph ends with \par. RTF can hold fonts, colours, tables and pictures, and nearly every word processor still reads it, which makes it a dependable exchange format.
Why does a Word to PDF conversion in the browser paginate differently?
Word decides every line break with its own layout engine, using exact font metrics, kerning, hyphenation, widow and orphan settings and anchored images, and no web page has that engine. A browser converter that keeps the file local reads the document's structure and lays it out again, so the content is the same but the pagination is not.
Which document format should I use?
DOCX is the safe default for collaborative editing, because Word, Google Docs, LibreOffice and Pages all read it well. ODT suits long-term archives where an open ISO standard matters, and RTF is a fallback for very old or very simple systems. HTML is for publishing, Markdown for documentation kept next to code, and plain text for anything a machine will read.
Engineering Manager, ML Engineer and Designer Interviews Explained
What mistakes do engineering manager candidates make in interviews?
Common engineering manager interview mistakes are describing a process with no person in it, citing vanity metrics such as lines of code or story points, avoiding the hard story about letting someone go or a failed hire, and saying "we" throughout. The interviewer is assessing your decisions as the manager, so name the conversation you had and the human outcome.
What is training-serving skew in machine learning?
Training-serving skew is when features are computed differently in batch training and in the live prediction service, so a model behaves differently in production than it did offline. In an ML engineer interview, mention shared feature code or a feature store as the fix. A related trap is leakage, where a feature that will not exist at prediction time gives great offline scores and a production failure.
Why should an ML system design answer include a baseline?
A baseline such as rules or logistic regression gives the model something to beat, and proposing a transformer before a heuristic suggests a candidate has not shipped models. In a fraud detection design, the baseline comes before features such as transaction velocity, device and merchant data, and a gradient-boosted tree model.
What should a UX portfolio case study cover?
Each UX case study should cover the context and challenge, including the users, constraints and your exact role; the process and approach, including options you rejected and why; the solutions and the reasoning behind key decisions; and the results and learning, with measured outcomes where you have them. Two or three deep case studies usually fill a 45 to 60 minute slot.
What are common mistakes in UI/UX designer interviews?
Common UI/UX designer interview mistakes are an unclear role in team projects, showing only happy paths without empty states, errors and edge cases, giving no outcomes, and presenting too many case studies. Even qualitative results from usability testing beat "the client was happy", and three deep projects show more than eight thin ones.
Fuel Costs, MPG and Tire Sizes: The Driving Maths Explained
What do the numbers in a tire size mean?
In a metric tire size such as 225/45R17, 225 is the section width in millimetres, 45 is the aspect ratio, meaning the sidewall height as a percentage of the width, R means radial construction, and 17 is the wheel diameter in inches. A suffix such as 91V gives the load index and speed rating, which do not affect dimensions.
How much speedometer error do bigger tires cause?
True speed equals indicated speed times the new tire diameter divided by the old one. Moving from 225/45R17 to 235/40R18 raises the diameter by 1.72%, so an indicated 60 mph is really 61.0 mph and the odometer under-records by the same amount. A widely used trade guideline is to stay within about 3% of the original diameter.
What is MPGe?
MPGe, miles per gallon equivalent, is the efficiency rating on US electric car window stickers. The EPA treats 33.705 kWh as the energy in one gallon of gasoline, so MPGe = 33.705 / kWh per mile, and a car doing 3.5 miles per kWh rates 118 MPGe. It compares efficiency, not cost, because a kWh and a gallon are priced very differently.
What is a plus-one tire size?
A plus-one tire size moves to a wheel one inch larger and trades sidewall for wheel, so the overall diameter stays almost the same. Going from 205/55R16 to 225/45R17 changes the diameter by only +0.38%, well inside the trade guideline of keeping a replacement within about 3% of the original diameter.
What is the MPG illusion?
The MPG illusion is the mistake of judging fuel savings by miles per gallon, which is distance per fuel. Over 10,000 miles a year, going from 15 to 20 MPG saves 167 gallons, while going from 40 to 50 MPG saves only 50, despite the bigger MPG gain. Fuel-per-distance units such as L/100 km show the real saving at a glance.
How Much Does a Meeting Cost? Salaries, Overhead and Time
What is the formula for the cost of a meeting?
Meeting cost is the sum, over everyone attending, of their loaded hourly rate multiplied by the hours in the meeting. For a group on the same pay it is simply people x rate x hours. The hourly rate is annual salary divided by 2,080 paid hours, and "loaded" means multiplied by an overhead factor, commonly 1.3 to 1.4.
How much does a one-hour meeting of six people cost?
Six people on 100,000 a year cost 48.08 an hour each, since 100,000 / 2,080 = 48.08. A one-hour meeting of all six therefore costs 288.46 in pay, or 403.85 with a 1.4 overhead multiplier that covers benefits and payroll taxes, which matches the BLS average share of benefits in total compensation.
Is a daily stand-up more expensive than a weekly meeting?
Not necessarily. A daily 15-minute stand-up of 8 people uses 480 person-hours a year over 48 weeks, exactly the same as a weekly 60-minute status meeting of 10 people. That is a useful point when someone defends a long weekly meeting as cheaper than a short daily one, or the reverse.
What costs does a meeting cost calculation leave out?
A meeting cost calculation measures direct time. It leaves out preparation and follow-up, the switching cost of getting back into deep work after an interruption, and the opportunity cost of what attendees would have produced instead. It also leaves out the value created: a one-hour decision meeting that saves a month of rework is cheap at any price.
How can I reduce the cost of meetings?
Invite only the people who must decide or contribute and share notes with everyone else: removing two people from a weekly hour of eight saves a quarter of its cost. Default to 25 or 50 minutes, write a short document first, review recurring meetings each quarter, and group meetings into blocks to protect focus time.
How OCR Works and How to Get Accurate Text From Images
How does OCR work?
OCR turns an image of text into characters in stages. The image is converted to greyscale and thresholded into black text on white, layout analysis splits it into blocks, paragraphs and lines, and each line is read by a recognition model. Tesseract 4 uses an LSTM neural network trained per language, and dictionary data helps choose between close alternatives.
What resolution is best for OCR?
Tesseract works best on images of at least 300 DPI, and accuracy drops when lower-case letters are under about 10 pixels high. Body text scanned at 300 DPI has an x-height of roughly 20 to 25 pixels, while 13 pixel interface text in a phone screenshot is only about 6 to 7 pixels, which is why small images are enlarged before recognition.
What is Tesseract OCR?
Tesseract is an open-source OCR engine developed at Hewlett-Packard between 1985 and 1994, released as open source in 2005 and later developed with Google's sponsorship. Version 4, released in 2018, added a recognition engine based on an LSTM neural network. Tesseract.js is the same C++ engine compiled to WebAssembly for use in the browser.
Which Tesseract page segmentation mode should I use?
Use automatic page layout (PSM 3) for normal documents, letters and book pages, and PSM 4 for receipts or single-column lists with mixed sizes. PSM 6 suits a cropped paragraph or code block, and sparse text (PSM 11) suits screenshots, forms and labels. If a UI screenshot comes back with words missing or out of order, sparse text mode usually fixes it.
Can OCR read tables?
OCR engines such as Tesseract recognise the words in a table but lose its structure, returning rows in reading order rather than cells. Table rules near the text can also confuse layout analysis and come out as stray characters, so cropping them away helps. Maths and chemical formulas are another weak spot and need specialised engines.
How PDF Compression Works: DPI, JPEG Quality and Lossless Tricks
Why is my PDF so large?
Most of a PDF's size sits in streams: page content streams, embedded font programs and images. A 30-page scan at 300 DPI holds one large image per page and can be tens of megabytes, while a 30-page text report exported from Word is often under 1 MB already. Slides and brochures with full-resolution photos can carry several megabytes per photo.
What JPEG quality should I use for a scanned PDF?
The Compress PDF presets use JPEG quality 50 for Smallest, 70 for Balanced and 80 for Print, on a slider from 20 to 95. Below about 50 the edges of small text start to look blocky. When a file is still too big, try 120 to 130 DPI before dropping quality below 60, because lowering resolution usually costs less legibility per byte saved.
What is FlateDecode in a PDF?
FlateDecode is the PDF filter for lossless zlib/deflate compression, defined in ISO 32000-1 section 7.4.4 and based on RFC 1950 and RFC 1951. PDFs use it for content streams, fonts and many images. Its counterpart, DCTDecode, holds baseline JPEG data and is used for photographs and most scans.
How do I reduce a PDF's size for email?
Start with lossless optimisation, and if it gets the PDF under the size limit, stop, because nothing was lost. If not, and the file is a scan or full of photos, try the Balanced preset at 150 DPI and JPEG quality 70, then zoom to 100% on the smallest text to check it. Always keep the original, since image compression is one way.
Why does lowering DPI shrink a scanned PDF so much?
Pixel count grows with the square of DPI, because a page rendered at D dots per inch is its width in points × D / 72 pixels wide. Halving the DPI quarters the pixels, so going from a 300 DPI scan to 150 DPI removes three quarters of the image data before JPEG compression even starts.
How to Compare Unit Prices and Spot the Real Bargain
How do I compare multipack prices?
Multiply the size of one item by the number in the pack before dividing the price. Multipack labels often give one item's size, such as 12 fl oz, rather than the whole pack's 12 x 12 fl oz = 144 fl oz. A twin pack of 28 ounce peanut butter jars for $10.98 holds 56 ounces, about 19.6 cents an ounce.
What price would make a smaller package the better deal?
Multiply the best unit price by the smaller package's quantity to get its break-even price. If a 40 ounce jar costs $6.99, about $0.17475 an ounce, a 16 ounce jar must cost less than $0.17475 x 16 = $2.80 to beat it. That also judges a promotion: "save $0.40" on a $3.29 jar still leaves it at $2.89.
Are unit prices on shelf tags always right?
Unit prices on shelf tags are usually right, but tags can be out of date when a price changes or a promotion starts. US unit pricing rules also vary by state, so one aisle can show prices per ounce, per count and per 100 sheets. If the numbers look odd or the bases differ, divide the price on the product by its size yourself.
How do I compare unit prices for laundry detergent?
Concentrates such as laundry detergent, squash and cleaning products come in different strengths, so compare them per load, per wash or per serving instead of per ounce. In the Unit Price Calculator, set the unit to items and enter the number of loads as the size, and the cheapest price per load comes out on top.
Should bottle deposits be included in a unit price?
Bottle deposits are refundable, so leave them out of a unit price if the containers will be returned. Non-refundable fees are part of the price and belong in it. The unit price itself is the price minus any coupon, divided by the total quantity, and scaled to one shared base such as 1 ounce, 100 grams or 1 litre.
How to Merge PDF Files Without Losing Pages or Quality
Why did my merged PDF lose its form fields?
Fillable PDF form fields are widget annotations plus an /AcroForm dictionary in the document catalog, and a merge creates a new catalog for the combined file. The fields still show their current values, because a filled field's appearance is part of the page, but they may stop being fillable. Fill in and save any forms before merging to keep the answers.
Can I combine PDFs with different page sizes?
Yes. Merging never changes page sizes, so a Letter report (612 × 792 points) followed by an A4 appendix (595 × 842 points) produces a PDF whose pages switch size. Every PDF reader handles that, and it prints correctly as long as the printer driver is set to fit or to choose paper by page size.
How do I merge scanned PDFs in the right order?
Sort the files by name with a natural sort, so scan2.pdf comes before scan10.pdf, which a plain alphabetical sort would put first. If a single-sided scanner produced fronts and backs as separate files, merge them and then use the duplex interleave button in Organize PDF Pages to put each page next to its back.
Why is my merged PDF bigger than expected?
A merged PDF can be larger than expected when two source files embed the same font, because they are separate objects in separate files and both copies are kept. It can also come out smaller, when the sources used old-style cross-reference tables, since the output packs objects into compressed object streams. Merging itself re-encodes nothing.
Can I merge PDFs on an iPhone?
Yes. The Merge PDF tool runs in JavaScript in the browser, so it works on iPhone and Android browsers as well as on desktops, and the files are never uploaded. Very large inputs of hundreds of megabytes are limited by the device's memory, because every file is held in memory while the new one is built.
How to Reorder, Delete and Duplicate PDF Pages
Does reordering PDF pages reduce quality?
No. Each PDF page is self-contained, with its own size, rotation, resources and content streams, so reordering changes only the list of pages. Text stays text, images keep their original resolution and nothing is recompressed. Printing to PDF or using Save as PDF again is different, because it re-renders the pages and can change fonts or image quality.
Is a deleted PDF page really removed from the file?
Yes. Organize PDF Pages builds a fresh document and copies only the pages that remain, so a deleted page's content is not carried along as hidden data. It is not a redaction tool, though: covering text on a page you keep with a black box leaves the original text underneath, still selectable and searchable.
How do I reverse the page order of a PDF?
Open the PDF in Organize PDF Pages, click Reverse order, then Save and download the result. That fixes a stack that was scanned last page first. The new file is built in the browser with pdf-lib, nothing is uploaded, and the content of each page is copied without being re-rendered.
Why remove blank pages from a scanned PDF?
A blank scanned page is still a full-page image, often tens of kilobytes or more, so deleting blank pages can shrink a scanned PDF noticeably as well as tidying it. Stray pages should also be deleted before interleaving a one-sided duplex scan, because a feeder double-pick changes every later page position.
Can I rearrange pages in a password-protected PDF?
Not until the protection is removed, because pdf-lib, which Organize PDF Pages uses to build its output, cannot decrypt protected files. Open the file in a reader that knows the password, save an unprotected copy, and rearrange that copy instead.
How to Run a Useful 1:1: Agendas, Questions and Cadence
Who owns the agenda in a one-on-one meeting?
The direct report owns a one-on-one meeting. Andy Grove made the case in High Output Management (1983): the report sets the agenda, the manager listens, and the meeting is the cheapest way for a manager to learn what is really happening on the team. Topics that can be answered from the board or standup do not belong there.
What questions should a manager ask in a 1:1?
Specific, slightly unusual questions work better than "Any blockers?", which usually gets "nope". Good examples include "What took more time this week than you expected?", "What is one thing I could do differently that would help you?" and "What decision are you waiting on someone else to make?". Ask one or two per meeting and rotate them.
How should an employee prepare for a 1:1 with their manager?
An employee can prepare for a 1:1 by writing three lines the day before: one thing that is going well, one thing they are stuck on, and one thing they want from their manager. Concrete requests, such as asking for thirty minutes with a specific team lead, get a far better response than a vague "I feel a bit blocked".
Should a manager cancel 1:1s during busy weeks?
No, a manager should not cancel one-on-ones when things are busy, because busy weeks are when they matter most. Shorten the meeting instead. Cancelling tells the report where they rank, so if a 1:1 has to move, reschedule it rather than dropping it.
How long should a one-on-one meeting be?
A weekly one-on-one usually runs 30 minutes, or 30 to 45 minutes for a new hire in the first 90 days. Experienced people on stable work can meet every two weeks for 45 to 60 minutes, and skip-level meetings run 30 minutes every 4 to 8 weeks. A 30-minute slot fits check-in, the report's topics, feedback, growth and action items.
How to Scale a Recipe Up or Down Without Ruining It
How do I calculate a recipe conversion factor?
A recipe conversion factor is the number every quantity is multiplied by. By servings it is servings wanted ÷ servings the recipe makes, so 6 from a recipe for 4 is 1.5. By pan size it is new pan area ÷ old pan area. By an ingredient you are short of, it is the amount you have ÷ the amount called for, such as 150 g ÷ 225 g = 0.667.
Can I use an 8-inch square pan instead of a 9-inch round pan?
Yes. An 8-inch square pan holds 64.0 square inches and a 9-inch round pan 63.6, a scale factor of 0.994, so the two are practically interchangeable without changing the recipe. Pans should be measured across the inside of the rim, and the area method assumes straight sides and the same batter depth.
How many tablespoons are in 1/4 cup?
There are 4 tablespoons in 1/4 cup, because US customary measures nest neatly: 1 cup = 16 tablespoons = 48 teaspoons, and 1 tablespoon = 3 teaspoons. US nutrition labels use a 240 ml cup, a 15 ml tablespoon and a 5 ml teaspoon, close enough to the customary measures that the difference never matters in a kitchen.
Should salt and spices be scaled up with a recipe?
Salt, spices, chilli and strong flavourings are perceived by taste rather than by ratio, so they do not always scale in a straight line. When multiplying a savoury recipe by 3 or more, many cooks start with less than the proportional amount and adjust at the end. Frying oil, pan grease and pasta water depend on the pan, not the quantity of food.
Should I scale baking recipes by weight?
Scaling baking recipes by weight is more reliable, especially by a large factor. A cup of flour weighs more when it is scooped and packed than when it is spooned in and levelled, so a scaled volume like 2 5/8 cups can vary noticeably between cooks. Convert the main dry ingredients to grams first, then scale.
How to Sign a PDF Electronically: Drawn, Typed and Digital Signatures
What does the ESIGN Act say about electronic signatures?
The US federal ESIGN Act (15 U.S.C. 7001 and following) says a signature, contract or other record relating to a transaction in or affecting interstate or foreign commerce may not be denied legal effect, validity or enforceability solely because it is electronic. The Uniform Electronic Transactions Act, adopted in nearly every state, says the same, while New York has its own Electronic Signatures and Records Act.
Which documents cannot be signed electronically in the US?
ESIGN section 7003 excludes wills, codicils and testamentary trusts; adoption, divorce and other family law matters; court orders and official court documents; utility cancellation notices; default, foreclosure or eviction notices on a primary residence; cancellation of health or life insurance; product recall notices; and hazardous materials documents. Many states also require notarisation or wet ink for deeds and certain filings.
What is a qualified electronic signature under eIDAS?
Under the EU eIDAS Regulation (EU) No 910/2014, amended by Regulation (EU) 2024/1183, a qualified electronic signature is an advanced electronic signature created by a qualified signature creation device and based on a qualified certificate. It is the only one of the three eIDAS levels that is equivalent to a handwritten signature, under Article 25(2). A placed signature image is a simple electronic signature.
What does flattening a signature in a PDF mean?
Flattening draws the signature image into the page's content stream instead of adding it as a movable annotation or form field. A flattened signature shows in every PDF reader, survives printing and "Print to PDF", and cannot be accidentally moved or deleted by clicking it. It is not protection, though: anyone with a PDF editor can still delete or copy the image.
Should I compress a PDF before or after signing it?
Compress a scanned PDF before signing it, so the signature image is not re-encoded as a blurry JPEG afterwards. More generally, sign last: fill in any text, add page numbers or merge files first, because some tools rebuild the file and a later edit is harder to justify if questioned. Keep the unsigned original and save the signed copy under a new name.
How to Split a PDF by Page Ranges, Every N Pages or Per Page
How do I split a PDF every 2 pages?
Choose the Every N pages mode in Split PDF and enter 2. Each output file then holds two consecutive pages, and the last part simply holds whatever is left over, so a 9-page file gives four two-page files and one single page. The mode suits uniform batches such as a scanner run of two-page forms.
How do I split a PDF by chapters?
Use the By ranges mode and type one range per chapter, separated by commas, such as 1-12, 13-30, 31-, where an open-ended range runs to the last page. Take the page numbers from the thumbnails rather than the printed table of contents, because printed page numbers often differ from PDF page numbers once the cover and front matter are counted.
How do I separate a batch scan of invoices into separate PDFs?
If every invoice in a batch scan is one page, use the Each page mode, which produces one single-page PDF per page. If the invoices vary in length, page through the thumbnails, note where each one starts, and enter ranges such as 1-2, 3, 4-6, 7 in By ranges mode to get one file per invoice.
Does splitting a PDF keep bookmarks and form fields?
No. Bookmarks belong to the whole document rather than to pages, so split parts lose them, along with links that jump to a page in another part. The document-level form dictionary is not copied either, so fillable fields may become static. Page content, fonts, images, page size, rotation, comments, web links and the original title and author are kept.
How are split PDF files named?
Each part is named from the original file name, a sequence number and the pages it holds, such as report_1_p1-3.pdf. The sequence number is zero-padded to the width of the file count, so 12 parts start at report_01, and the files sort in order. With several parts, Download all packs them into report_split.zip.
How to Watermark a PDF: Text, Logos, Opacity and Placement
What is the best opacity for a watermark?
For DRAFT or CONFIDENTIAL across text pages, 20 to 35% opacity is clearly visible while the text underneath stays easy to read, and the Watermark PDF tool defaults to 25%. Background branding and tiled ownership marks suit 10 to 20%, SAMPLE or PREVIEW stamps on proofs 40 to 60%, and small corner logos 70 to 100%.
What angle is a diagonal watermark?
A diagonal watermark running from the bottom-left corner to the top-right follows the angle arctan(height ÷ width), so it depends on the page shape. On a US Letter portrait page (612 × 792 pt) it is 52.31°, on A4 portrait 54.74°, and on US Letter landscape 37.69°. A diagonal stamp crosses every line of text and is hard to crop out.
What is a tiled watermark?
A tiled watermark repeats the text or image in a grid across the page, with every second row shifted by half a step so the stamps do not line up in columns. It is harder to remove by cropping or by covering one spot than a single centred stamp, which makes it the usual choice for preview copies of photos, plans or reports sent before payment.
Should a PDF watermark go on top of or under the page content?
On top, at low opacity. Many scanned PDFs are one opaque full-page image, so a watermark drawn underneath would be completely hidden. The Watermark PDF tool appends the watermark to the end of each selected page's content, so it is drawn over the existing text and images and tints rather than hides them.
How is a watermark stored in a PDF?
An ordinary PDF has no special watermark object. A watermark is extra drawing added to a page's content, text in a font or an image, placed with a transformation matrix that sets its position, scale and angle. Transparency comes from the graphics state's /ca fill opacity (ISO 32000-1, section 8.4.5): text drawn at 0.25 lets 75% of the page show through.
Inside an EPUB: Structure, Fixed Layout, Kindle Formats and DRM
What is inside an EPUB file?
An EPUB is a ZIP archive, closer to a small zipped website with a manifest. It starts with an uncompressed mimetype file containing application/epub+zip, then META-INF/container.xml points to the package document, whose metadata, manifest and spine describe the book. The chapters are XHTML files styled with CSS, plus images and a navigation document for the table of contents.
What is the difference between reflowable and fixed-layout EPUB?
A reflowable EPUB has no pages in the file: the reading app lays out text for the reader's screen, font and margins, which suits novels, non-fiction and documentation. A fixed-layout EPUB sets rendition:layout to pre-paginated, making each content document a designed page, which suits picture books, comics and cookbooks but shows a shrunken page on small screens.
Is EPUB or PDF better for ebooks?
EPUB is better for reading on phones, tablets and e-readers, because reflowable text adapts to any screen. PDF fixes every glyph at a position on a page, which is perfect for print, forms and archiving but poor on a six-inch screen, where you pan and zoom. Choose PDF when pages must look identical everywhere or will be printed.
What is the difference between EPUB and MOBI?
EPUB is an open W3C standard, a ZIP of XHTML, CSS and images read by Apple Books, Kobo, Google Play Books and most apps. MOBI is the old Mobipocket format Amazon acquired in 2005, with no real CSS support, and it is effectively retired. Since 2022, Amazon's Send to Kindle service accepts EPUB files and no longer accepts MOBI.
Why does my hand-made EPUB fail EPUBCheck?
The most common cause is the mimetype file. The first entry in an EPUB's ZIP must be a file named mimetype, stored without compression or extra fields, containing exactly application/epub+zip. Zipping a folder with a normal archiver usually breaks that rule, and stores such as Apple Books and Kobo reject files that fail EPUBCheck.
Kanban Boards That Improve Flow: WIP Limits and Little's Law
What is Little's Law in Kanban?
Little's Law, proved by John Little in 1961 for queues in a steady state, says average cycle time equals average work in progress divided by average throughput. A team finishing 5 items a week with 20 in progress takes about 4 weeks per item, and cutting work in progress to 10 halves that to 2 weeks, which is the arithmetic behind WIP limits.
Who invented Kanban?
Taiichi Ohno developed Kanban at Toyota from the late 1940s as part of the Toyota Production System. The Japanese word means "signboard" or "card", and a card returning upstream signalled that more parts were needed. In the mid-2000s David J. Anderson applied the idea to software teams, and his 2010 book made "the Kanban method" a standard term.
How should I set up Kanban board columns?
Keep Kanban columns few and name them after states, not people or teams. A common start is To Do, In Progress, In Review and Done, with WIP limits on the two middle columns, such as 3 to 4 and 2 to 3 for a four-person team. Add a Blocked or Waiting column where work really waits, and define what done means for each column.
How do I measure cycle time on a Kanban board?
Count the cards that reach Done in a week: that is the team's throughput. Divide the number of cards in progress by that throughput and you have a rough average cycle time, from Little's Law, to compare against the next week. Done is where throughput is measured, so count it weekly.
PDF Page Numbers and Bates Numbering: Formats, Placement, Rules
What is the difference between PDF page labels and printed page numbers?
Printed page numbers are text drawn on the page, so they show in every reader, print on paper and can be searched. Page labels are a document-level number tree, defined in ISO 32000-1 section 12.4.2, that only changes what a PDF reader shows in its page box and thumbnails. Labels never appear on paper, so the two can disagree.
Where should page numbers go on a PDF?
Bottom centre is the most common position for reports and letters because it is equally visible on left and right pages. Bottom right or top right suits single-sided documents flipped like a notepad, and legal productions conventionally put Bates numbers at the bottom right. Keep the margin at 0.3 in or more if the file will be printed.
How many digits should a Bates number have?
A Bates number commonly has 6 to 8 digits, enough to cover every page in the whole case, after a short prefix for the producing party, as in ACME000001. Zero padding keeps every number the same length so they sort correctly in file lists and review software. Check any agreed protocol or court order before settling the format.
How do I continue Bates numbering from a previous production?
To continue Bates numbering, set the first number to one more than the last page already produced and keep the same prefix and digits. If the first production ran ACME000001 to ACME000250, an 80-page file starting at 251 runs ACME000251 to ACME000330. Several files can be numbered with the right starting values or merged first and numbered once.
Can page numbers count pages that are skipped?
Yes, with Count skipped pages turned on in Add Page Numbers to PDF, pages left out of the range still advance the counter. For the range 1-3, 6-8 the pages then show 1, 2, 3, 6, 7, 8 instead of running on as 1 to 6. Use it when skipped pages, such as fold-out maps or blank separators, still count physically.
PDF to Image and PDF to Word: What Survives the Conversion
Why is PDF to Word conversion never exact?
PDF to Word conversion is never exact because a PDF stores drawing instructions, not paragraphs: each line is placed at a coordinate, often without space characters, and headings are just larger text. A converter must infer paragraphs, headings and lists from positions. The words, reading order and outline survive, but fonts, colours, columns, table grids and exact positions are lost.
How do I convert a scanned PDF to Word?
A scanned PDF holds only a picture of each page and no text layer, so PDF to Word finds nothing to extract. Use optical character recognition instead: the Image to Text (OCR) tool renders scanned PDF pages at 300 DPI and recognises the letters. Hybrid PDFs with an invisible OCR layer convert normally, with that earlier OCR's quality.
Is PNG or JPG better for converting PDF pages to images?
PNG is better for text pages, diagrams and slides because it is lossless, keeping thin rules, small type and flat colours exact. JPG is far smaller for scans and photographs, though it can leave faint ringing around sharp letter edges. A JPG quality of 85 to 90 is usually indistinguishable from the original for scans and photos.
Why does text copied from a PDF come out as gibberish?
Text copied from a PDF comes out as gibberish when the font's ToUnicode table, which maps glyph codes to Unicode characters, is missing or wrong. The page can look perfect while its text extracts as nonsense, and such a PDF will also convert to Word as nonsense. Optical character recognition is then the fallback for recovering the words.
How many pixels is a PDF page at 300 DPI?
A PDF page's pixel size is points × DPI ÷ 72, since PDF coordinates use points of 1/72 inch. A US Letter page at 300 DPI is 2550 × 3300 pixels, suited to printing at original size and OCR. At 150 DPI it is 1275 × 1650, and doubling DPI roughly quadruples memory use and file size.
Recording Your Screen as a GIF in the Browser: Permissions, Limits and Size
What is getDisplayMedia?
getDisplayMedia is the function in the browser's Screen Capture API that lets a web page record the screen. Calling it opens the browser's own share dialog, and the page gets back a MediaStream only after the user picks a screen, a window or, in Chromium browsers, a single tab and clicks Share. It works only on HTTPS pages and must be started by a click.
Which browsers support screen recording from a web page?
Desktop Chrome, Edge and Opera have supported screen capture since Chrome 72 in 2019 and can share a screen, window or tab. Desktop Firefox has supported it since version 66 and Safari on macOS since version 13, both sharing a screen or window. No mobile browser implements getDisplayMedia, so phones need their built-in screen recorder.
What frame rate should I use for a screen recording GIF?
UI demos look fine at 8 to 12 frames per second, and 10 is a good default. Going from 30 to 10 frames per second cuts the frame count by two thirds, which shrinks the GIF a lot. Recording the smallest window that shows the problem, at 10 frames per second, keeps most screen GIFs under a couple of megabytes.
Why does my screen recording GIF play too fast?
Older recorders assume every frame was captured exactly on schedule, so if the computer captured fewer frames than requested, the GIF plays back too fast. Recorders that stamp each frame with the time it was really taken, as Screen Capture to GIF does, use the real gaps as GIF delays, so a 12-second recording still loops in 12 seconds.
Should I use GIF or MP4 for a screen recording?
Use GIF for loops of a few seconds that must autoplay everywhere, such as GitHub issues, Jira tickets, Slack threads and README files. If the GIF is still several megabytes, an MP4 or WebM of the same clip is typically far smaller, and most issue trackers play it inline. GIF also has no audio track, so narration needs a video format.
RedBison Now Has 563 Free Tools: What's Included and What's New
How many free tools does RedBison have?
RedBison's catalog stands at 563 free tools in 12 categories, with 143 added in the five days after the post about passing 400 tools. The largest categories are Tech Tools with 106, Calculators with 85 and Engineering Calculators with 78. Every tool is free, has no ads, needs no account and comes with a write-up and a guide.
Do RedBison's AI tools need an API key?
No. None of RedBison's 30 AI tools call a language model or need an API key. They build, check and calculate in the browser, so confidential prompts and data can be pasted in. They cover prompt engineering, model training, agents and MCP, observability and visibility, and prompt kits for professions such as nurses and civil engineers.
Are files uploaded when using RedBison's PDF tools?
No. RedBison's eight PDF tools, including Merge PDF, Split PDF, Compress, Rotate, Organize, Watermark, page numbers and Sign PDF, read, edit and save the file in the browser and never upload it. The Video Trimmer and Audio Trimmer likewise cut files locally, using ffmpeg compiled to WebAssembly.
How are RedBison's tools tested for accuracy?
Every new RedBison tool arrived with tests for its logic before it shipped, with expected values taken from standards, reference data sets and published tables wherever possible. Across the whole catalog, 4,821 automated tests check that the tools give the right answers, and the six statistics calculators are tested against NIST's certified reference data sets.
Can RedBison tools be used from an AI assistant?
Yes. Many RedBison calculators and text tools are available to Claude, Cursor and other assistants through the RedBison MCP server, which runs the same code and gives the same answers as the web pages. RedBison's AI and MCP page explains how to connect an assistant to the server.
Rotate PDF Pages Permanently: How /Rotate Works and Why Views Reset
What is the /Rotate entry in a PDF?
/Rotate is an optional entry on each PDF page object, defined in ISO 32000 section 7.7.3.3, giving the number of degrees the page is rotated clockwise when displayed or printed. It must be a multiple of 90. A page without its own /Rotate inherits one from its parent node in the page tree, and if none is set anywhere it is 0.
How do I fix upside-down back pages in a scanned PDF?
Select the even pages and rotate them 180°. In Rotate PDF, click Even, then 180°, and a 12-page double-sided scan has pages 2, 4, 6, 8, 10 and 12 turned while the fronts stay as they are. Only each page's /Rotate entry changes, so the content is not re-rendered and text stays searchable.
Can I rotate an encrypted PDF?
Not in Rotate PDF. Encrypted PDFs cannot be edited there, including files that open without a password but restrict changes. Printing the document to a new PDF first produces an unrestricted copy, which can then be rotated and saved.
Why does a rotated PDF page print small or off-centre?
Print dialogs often have their own auto-rotate and centre option that picks the paper orientation for each page, and it can make a rotated page print small or off-centre. Printers honour the page's /Rotate entry, so check that print option before assuming the PDF file itself is wrong.
How do I rotate only the landscape pages in a PDF?
In Rotate PDF, click Landscape to select only the pages that are currently displayed wide, then rotate them. That suits a portrait handout with landscape slides that should all print portrait, though turning a landscape page to portrait makes its content run sideways, which suits binding but not reading on screen.
Standups, Retrospectives and Project Dashboards: Running the Scrum Ceremonies
How long should a daily standup be?
The Scrum Guide timeboxes the Daily Scrum to 15 minutes for the whole meeting, not per person. Six people at two minutes each take 12 minutes, leaving three minutes of buffer, while eight people at two minutes already exceed the timebox. Side topics go in a parking lot and are discussed after the standup by only the people involved.
How long should a sprint retrospective be?
The Scrum Guide timeboxes the Sprint Retrospective to at most three hours for a one-month sprint, and it is usually shorter for shorter sprints. Its purpose is to plan ways to improve quality and effectiveness. A sensible flow is five minutes of silent writing, a few minutes of reading and voting, then discussion of the top two or three improvement items.
What is the retrospective Prime Directive?
The Prime Directive comes from Norm Kerth's 2001 book Project Retrospectives: "Regardless of what we discover, we understand and truly believe that everyone did the best job they could, given what they knew at the time, their skills and abilities, the resources available, and the situation at hand." Facilitators read it to move a retrospective from who to what.
What is a Start, Stop, Continue retrospective?
Start, Stop, Continue is a retrospective format that asks the team what to start doing, what to stop doing and what to continue doing. On a three-column board, Continue items fit What Went Well, Stop items fit What to Improve, and Start items become Action Items written as concrete changes. Prefixing each item with its original label keeps the distinction in the summary.
What makes a good retrospective action item?
A good retrospective action item is one concrete change with an owner and a date written into it, such as "Add flaky-test report to CI (Priya, by Thursday)". One owned, dated action per sprint beats five vague ones. Start the next retrospective by checking last sprint's actions, because the same actions repeating sprint after sprint means they are not being done.
Stopwatches, Countdown Timers and Clocks in the Browser: Why Time Drifts
Why does setInterval drift?
setInterval(fn, 10) means run no sooner than 10 ms from now, not every 10 ms. Nested timers are clamped to at least 4 ms, a busy main thread delays them, background tabs throttle them to once per second, and since Chrome 88 hidden pages can be limited to once per minute. Code that adds a fixed amount per tick inherits every delay as error.
Should I use Date.now() or performance.now() for a timer?
performance.now() is monotonic, so a system clock change cannot make it jump, but in some browsers it does not advance while the machine sleeps. For a stopwatch that should include sleep time, Date.now() is the better fit. Either way, measure elapsed time from a stored start timestamp rather than counting timer ticks.
What is intensive timer throttling in Chrome?
Since Chrome 88, chained timers in a page that has been hidden for more than five minutes can be limited to running once per minute. A countdown alert in a tab hidden for a long time can therefore be up to about a minute late, even when the deadline itself is stored exactly. The display is correct again as soon as the tab is visible.
Why should a world clock use IANA time zones instead of UTC offsets?
Fixed UTC offsets are wrong for part of every year, because daylight saving changes them: New York is UTC-5 in January and UTC-4 in July, while Sydney moves the opposite way. Some places use 30- or 45-minute offsets, and rules change. The IANA time zone database tracks all of it, and browsers expose it through Intl.DateTimeFormat.
How do I keep a clock display in sync with the real second?
Schedule each update for just after the next whole second, with setTimeout(tick, 1000 − (Date.now() % 1000) + 5), rather than a setInterval started at a random moment. The extra 5 ms makes the update land after the boundary, not just before it, so the display changes when the real second changes.
Structuring a Mentorship: From First Meeting to Last Session
What is the difference between a mentor, a manager and a coach?
A manager has authority over your work and focuses on your current role and performance. A mentor has no authority, shares their own experience and helps with career and long-term direction, with the mentee setting the agenda. A coach works on a specific skill or behaviour and rarely shares their own experience.
How do I become a good mentor?
A good mentor is on time, keeps the cadence and asks before advising. Share failures as readily as successes, give honest feedback on real artefacts such as a design doc or promotion packet, and make the introductions you promise. Aim for roughly 30% mentor and 70% mentee talking, and ask now and then whether the sessions are useful.
What questions should a mentor ask a mentee?
Useful mentor questions push the mentee to think: "What are you hoping is different six months from now?", "What have you already tried?", "What would you do if I weren't here to ask?", "What is the real worry underneath this question?" and "What will you do before we next meet, and how will I know?"
What are the career and psychosocial functions of mentoring?
Kathy Kram's research in Mentoring at Work (1985) described two kinds of help mentors give. Career functions include sponsorship, introductions, visibility and stretch opportunities. Psychosocial functions include encouragement, honest counsel and acting as a role model. The best mentors do both, so a mentee who only gets advice can ask for one specific introduction.
When should a mentorship end?
A mentorship that has achieved its goal should end or change focus. Every three to six months, a milestone review looks back at the original goals and chooses to continue, change focus or end. Ending well, with thanks and a summary of what changed, keeps the door open for later.
The Pomodoro Technique: How to Use 25-Minute Focus Sessions
What is the Pomodoro Technique?
The Pomodoro Technique is a focus method built on fixed work intervals: set a timer for 25 minutes, work on one task until it rings, take a 3 to 5 minute break, and repeat. After four pomodoros, take a longer break of 15 to 30 minutes. A pomodoro is indivisible, so an abandoned one does not count.
Who invented the Pomodoro Technique?
Francesco Cirillo developed the Pomodoro Technique as a university student in Italy in the late 1980s, while trying to study with fewer distractions. He used a kitchen timer shaped like a tomato, and pomodoro is Italian for tomato. Cirillo later wrote the method up and has taught it to teams and companies ever since.
How long is one full Pomodoro cycle?
One full Pomodoro cycle of four 25-minute pomodoros, three 5-minute short breaks and a 15-minute long break takes 130 minutes, a little over two hours. A typical working day holds three or four cycles. Using a 30-minute long break instead stretches the cycle, and suits long days or tiring work.
What is the 50/10 Pomodoro method?
The 50/10 method is a deep work variation of the Pomodoro Technique: 50 minutes of focus, a 10-minute short break, and a 30-minute long break after three sessions. It suits work with a long ramp-up, such as writing, programming or design, where a classic 25-minute pomodoro ends just as you get going.
How do I estimate tasks in pomodoros?
List the day's tasks each morning and estimate each one in pomodoros, rounding up, so 70 minutes of focused work is three pomodoros. Split any task estimated at more than five to seven pomodoros, and group tasks under one pomodoro together. Comparing estimates with actuals each evening makes most people noticeably better at estimating within a few weeks.
The STAR Method for Behavioral Interviews, with Examples
What do interviewers look for in a behavioral interview?
Behavioral interviewers collect evidence against a set of competencies, usually some mix of ownership, collaboration and handling conflict, dealing with ambiguity, influence without authority, delivering results under constraints and learning from failure, plus developing people for leads and managers. The premise is that past behaviour in real situations predicts future behaviour better than answers to hypotheticals.
What stories should a behavioral interview story bank cover?
A behavioral story bank should include a significant achievement you drove, a conflict or disagreement ideally with someone senior, a real failure with consequences, a decision made with incomplete information, influencing people who did not report to you, and helping someone else grow. Keep stories from the last two or three years, and note which questions each story could answer.
What follow-up questions come after a STAR answer?
Expect probes such as "What would you do differently?", "What did the other person think of your approach?", "What was the hardest moment?", "How did you know it worked?" and "What would have happened if you had not stepped in?". Prepare by knowing each STAR story in more depth than you plan to say, because honest, specific stories survive probing and vague ones do not.
What makes a strong result in a STAR answer?
A strong STAR result gives a number where one exists, such as latency, error rate, time saved, revenue or customer count, a concrete before and after where it does not, and one sentence on what you would do differently. "It went well" is not a result, and a story with no result sounds unfinished, so interviewers assume it did not go well.
How do I prepare for a behavioral interview in one week?
On day 1, list twelve situations from the last three years and pick the six to eight strongest. On days 2 and 3, write each in STAR form. On day 4, map stories to competencies and fill gaps. On days 5 and 6, say each story aloud against a two-minute timer and record yourself once. On day 7, do a mock with a friend who asks follow-ups.
Unit Conversion Factors: Exact Definitions, Gallons and Temperature Offsets
Why are inches and pounds defined in metric units?
Since a July 1959 agreement between the US, UK, Canada, Australia, New Zealand and South Africa, the international yard has been exactly 0.9144 metres and the avoirdupois pound exactly 0.45359237 kilograms. Before then the US and British inches differed slightly. Every other factor follows by arithmetic, so the inch is exactly 2.54 cm and the mile exactly 1,609.344 m.
How many square metres are in an acre?
One acre is exactly 4,046.8564224 square metres. An acre is 43,560 square feet, and since 1959 the foot has been exactly 0.3048 m, so a square foot is exactly 0.09290304 m². A converter that shows 4,046.86 m² is rounding a definition, not measuring, and rounded factors drift further when squared for area.
How do I convert a temperature difference from Celsius to Fahrenheit?
Multiply a temperature difference by 9/5 only, without adding 32, because the 32° offset applies to temperature readings rather than changes. A rise of 10 °C is therefore a rise of 18 °F, not 50 °F. With a converter built for temperatures, convert both ends of the range and subtract to get the difference.
What is the US survey foot?
The US survey foot is 1200/3937 metres, kept for land surveying after 1959 because so many maps were built on it. It differs from the international foot of exactly 0.3048 m by about 2 parts per million, or roughly 3 mm per mile. NIST and NOAA retired it at the end of 2022, though old US land records still use it.
How many millilitres are in a US cup?
A customary US cup is 236.588 ml, half of a US pint of 473 ml. The cup used in US nutrition labelling is slightly larger at 240 ml, and British pints and gallons differ again, since an imperial pint is 568 ml. Those small differences are why baking by weight is more reliable than measuring by volume.
Weighted Decision Matrix and Impact vs Effort Scoring, Worked Through
How do I make a weighted decision matrix?
List the options as columns and the criteria as rows, give each criterion a weight for how much it matters, then score each option on each criterion. Multiply every score by its row's weight and add each column to get a total per option. In the Decision Maker, weights run from 1 to 10 and scores from -10 to +10.
Should I set the weights before scoring the options?
Yes. Set the weights in a weighted decision matrix before looking at the options in detail, ideally with the people affected by the decision, and then leave them alone. If you score first, you will be tempted to nudge the weights until your favourite option wins, which defeats the purpose of making the trade-offs explicit.
What is an impact effort matrix?
An impact effort matrix is a 2x2 grid that plots each idea by how much it would help and how much it would cost. Quick wins are high impact and low effort, big bets are high impact and high effort, fill-ins are low on both, and money pits are low impact and high effort. It is a lighter tool than a weighted decision matrix for long backlogs.
How is the signal score calculated in the Ideas Organizer?
The Ideas Organizer's signal score is min(10, round(impact / effort × 10)), with impact and effort each scored from 1 to 10. Any idea whose impact is at least as high as its effort reaches the cap of 10. A score of 7 or above counts as high signal, 4 to 6 as medium and below 4 as low.
Why is a pros and cons list not enough to make a decision?
A pros and cons list counts arguments but does not weigh them, so two options with equally long lists end in a shrug. A weighted decision matrix separates two questions: how much each criterion matters and how well each option does on it. Negative scores can also show how bad a con is, from slightly worse than neutral to nearly ruling an option out.
Your Life in Weeks: The Grid, the Maths and How to Use It
How many weeks are in a year?
A year is slightly more than 52 weeks. A common year has 365 days, which is 52 weeks and 1 day, and a leap year has 366 days, 52 weeks and 2 days. Averaged over the 400-year Gregorian cycle, a year is 365.2425 days, or 52.1775 weeks, which adds about 14 extra weeks over an 80-year life.
What is a memento mori calendar?
A memento mori calendar is a chart of a whole life in boxes, such as Tim Urban's 2014 "Your Life in Weeks" grid of 90 rows of 52 weeks, that keeps the shortness of life in view. Memento mori is the Stoic practice of keeping death in view on purpose, and Seneca's essay On the Shortness of Life argues life is long enough if used well.
Should a life calendar be in weeks, months or years?
Each unit suits a different purpose. Weeks, at 52 per row, give about 4,000 boxes and make a single week feel small. Months, at 12 per row, give 960 boxes for 80 years and show seasons of life such as a degree or a job. Years, at 10 per row so each row is a decade, suit long-range plans.
Why does dividing days by 365.25 give the wrong age?
Dividing days lived by 365.25 and rounding down can make someone a year younger on their birthday. 1,095 days after 1 January 2001 is 1 January 2004, a third birthday, yet 1,095 ÷ 365.25 is 2.998. Calendar age, counted from actual birthdays, avoids the error.