Start with decisions from real text
A useful style sheet grows out of the document. Collect repeated names, specialist terms, abbreviations, capitalization choices, and number conventions as you encounter them. Begin with the points that could reasonably be written in more than one way.
Do not copy a whole published style manual into the sheet. Identify the manual or dictionary being followed, then record project-specific decisions and exceptions. This keeps the sheet short enough to consult during ordinary writing and review.
Write entries that remove ambiguity
A bare preferred spelling may be sufficient for a simple term. A more complicated choice needs a context and an example. If capitalization changes when a phrase names a formal program, show both the formal name and a generic use.
Distinguish approved decisions from open questions. A question mark beside an entry can be missed when the sheet is passed to another contributor. Give unresolved items their own section and identify who is responsible for resolving them.
Organize around retrieval
Choose categories that match the project: names and terminology, numbers and dates, abbreviations, headings, references, and voice notes may be enough. Within each category, alphabetical order often makes an entry easier to locate.
If a term appears in more than one category, use a cross-reference rather than maintaining competing versions of the same rule. The goal is a single reliable decision, not an impressive-looking document with many headings.
Give the sheet an owner
Someone needs to decide when a new convention becomes official. Without ownership, contributors may add conflicting preferences or continue following an older copy. Include a revision date and identify the current version.
When the sheet changes, assess whether existing material needs to change too. A new spelling rule may affect headings, image captions, tables, and downloadable files as well as body text. Keep a short record of consequential changes so the update can be applied deliberately.
Use it during review
Check the document against the sheet near the end of the edit. This is the point at which exceptions and missed occurrences often become visible. Do not force a rule into a context where it changes meaning; flag the exception for a decision.
The downloadable template in the toolkit provides fields for a preferred form, context, and example. Treat it as a starting structure. Add only the categories the writing needs, and remove empty sections that make the reference harder to navigate.