Window

Pin down the exact stretch of time the number covers, and how long each person gets to produce the behavior you are counting. State the start, the end, and the clock each case runs on, so nobody silently stretches or shortens it later.

Pin down the exact stretch of time the number covers, and how long each person gets to produce the behavior you are counting. State the start, the end, and the clock each case runs on, so nobody silently stretches or shortens it later.

Example

On the activation card you write: signups from March 1 through May 31, each user given 14 days from their signup date to return and log in. A user who signs up May 25 is judged on June 8, not cut off at May 31.