A small reference notebook
Choose a subject below. Each note can be read on its own.
Submitting an action, observing it finish and checking the intended result are different steps. A useful record distinguishes them. When the outcome is uncertain, start by finding out what happened rather than assuming that the action never ran.
A short note should say what was observed, when it was observed and what remains unknown. Separate a direct observation from an explanation that has not been tested. That distinction lets a later reader use the evidence without inheriting every assumption.