Why intervals alone are not enough
An interval expressed as quarterly sounds precise but behaves loosely. Without a starting date and a record of completion, quarterly becomes whenever somebody notices, and the gap between the second and third occurrence quietly stretches. It is rarely a deliberate decision; it is simply that nobody has anything to check against and the floor has not yet reached the point of complaint.
A dated register converts the interval into a commitment. If the schedule says the administration carpet is due in March and it was last done in November, both the interval and the slippage are visible at a glance. That visibility is what allows a manager to make a decision about it, rather than discovering the position when the floor has already deteriorated.
