An account with no purchase inside a window, ninety days being usual, or longer than three times the account's own typical interval between orders. Ranked by past value, the list is the reactivation plan.
A global window catches accounts that buy on a normal rhythm. The account's own interval catches the ones that buy monthly and have missed three months, which the global window would call fine.
A contractor between projects, a seasonal kitchen. The rep marks the reason and the account moves to a watch list rather than the reactivation list.
Days since last order compared with a threshold of a stated multiple, usually two to three, of the account's own typical gap between orders. Reported by count and by prior-year revenue.
An account that ordered weekly has not ordered for 41 days against a threshold of 18: dormant. One that orders twice a year and last ordered 120 days ago is not.
A fixed 90-day rule. It lists annual buyers who are fine and misses weekly buyers who left a month ago.