The four records that answer most questions
Attendance comes first: which dates the premises was serviced. It is simple to maintain and it underpins everything else, because a periodic task claimed on a date with no attendance record is difficult to defend. Second is periodic completion, listing each programmed item, its interval and the date it was last performed, which is the record most audits actually look for. Both records are simple to maintain and neither requires a system beyond a shared sheet.
Third is product documentation for the chemicals used, kept current and available on site or on request. Fourth is an issues log recording what was reported, when, and what happened next. That last one is often the most useful in practice, because it demonstrates that observations were acted on rather than simply noted, which is usually the point an auditor is testing. An issues log also gives the business a record of matters it raised, which is useful in its own right.
