Why Your Own Rulebook Beats Guesswork

You already have a writing style. You just haven't written it down, which is why the same word can appear as "email" on Monday and "e-mail" on Friday, and why one report calls it "the north of England" while the next says "the North of England". Readers rarely notice a single inconsistency, but they notice a pattern of them. It quietly signals haste, and in anything longer than a page it makes the argument harder to follow.

A personal style guide is simply a short list of decisions you've made once so you don't have to make them again at the end of a long day. It also speeds you up. Every pause over a hyphen or a capital letter is a small interruption to the flow of typing, and those interruptions are where accuracy slips. Giving yourself a ruling in advance removes the pause and keeps your hands moving.

Start With the Words That Trip You Up

Begin by noticing, not deciding. For a week, keep a running note of every word or phrase that makes you hesitate. You'll find the same few culprits again and again:

• -ise or -ize? British writing overwhelmingly favours -ise (organise, recognise, apologise). Pick it and stop thinking about it.
• Compounds that shift shape: email or e-mail, website or web site, online or on-line. Also watch pairs where the part of speech changes the spelling: log in (verb) and login (noun), set up and setup.
• Practice or practise? Noun and verb respectively, in British English. The same pattern applies to licence and license, advice and advise.
• Small variations: judgement or judgment, focused or focussed, towards or toward, while or whilst. None is wrong, so the only mistake is mixing them.
• Numbers: words up to nine, figures from 10 onwards, unless a figure starts a sentence.

Decide Your Capitalisation Rules

Capitalisation is where personal style shows most clearly, so it's worth a firm decision on each of these:

• Job titles. Lower case in running text (the marketing manager), capitals in a signature block or on a name badge. Choose one approach for each context.
• Headings. Sentence case is far easier to keep consistent than title case, which raises endless questions about small words.
• Institutions and places. "The government" or "the Government"? "The north" or "the North"? Whatever you choose, apply it every time.
• Subjects and seasons. History, maths and spring all take lower case unless they form part of a formal course title.
• Your recurring names. Project names, product names and team names deserve their own line in the guide, spelled and capitalised exactly as you want them.

Sort Out Formatting and Punctuation

This is the section that saves the most time, because these details appear in nearly every document:

• Dates: 12 March 2025. No ordinal suffix, no comma.
• Times: 9.30am, 2pm, 4.15pm. Full stop rather than colon, no space before the am or pm.
• Percentages and units: 45%, 12kg, 3km.
• Quotation marks: single for speech, double for quotes within quotes. Punctuation sits outside the closing mark unless it belongs to the quoted words.
• Dashes: a spaced en dash – like this – for asides, and hyphens only inside compound words.
• Lists: capitalise the first word, and use full stops only when each point is a complete sentence.
• The Oxford comma. Yes or no, then never waver.
• Spacing. One space after a full stop, never before a punctuation mark, no stray double spaces.

Keep It Where You'll Actually Use It

A style guide that lives in a folder you never open is decoration. Put it where your fingers already are:

• Keep it as a single page or plain-text file you can open with one keystroke. One screen, no scrolling.
• Use your word processor's autocorrect and text expansion for the handful of words you mistype most. Fix "recieve", "seperate" and "teh" permanently, and set a short trigger to type your standard date format.
• Paste the key rules at the top of your most-used template, so you see them before you begin rather than after.
• Add a "decisions" section at the bottom and log new rulings as they come up. It takes twenty seconds and saves an argument with yourself later.

Review It Twice a Year, and Trust It

Language moves, and so will you. Twice a year, read the whole thing in one sitting and prune anything you've stopped following. If you've broken a rule three times, it probably isn't your style — change the rule rather than fight yourself.

Finally, use the guide alongside a proper read-through, not instead of one. Consistency rules catch the slow drift; reading aloud catches the slips your fingers make, the doubled words, the missing "not", the "form" that should be "from". Those errors live in a different part of the brain from style, and they need their own pass. Do both, and every document you send out will sound unmistakably like you — the same you, whichever project it belongs to.