Capturing how things are done.
FROM A ROUGH DESCRIPTION
"Here is how we do [task], described roughly: [paste or dictate]. Turn it into a numbered procedure someone could follow without asking questions."
FINDING THE GAPS
"What questions would someone following this procedure have that it does not answer?"
ADDING FAILURE CASES
"Add a section covering what to do when things go wrong at each step, and who to ask."
A CHECKLIST VERSION
"Turn this procedure into a short checklist someone can tick off."
A GUIDE FOR A CUSTOMER
"Write a guide explaining how a customer can [do the thing themselves]. They are not technical. Numbered steps. Say what they will see at each stage."
A STAFF HANDBOOK SECTION
"Write a section covering [topic] for staff. Plain language. State what is expected and who to ask."
WHAT TO ALWAYS DO
Follow the procedure yourself. Documentation nobody tested contains errors.