If you have unplanned work or rework, it means the initial job wasn't good enough.
A concept created by John Seddon[1]: the demand for work (unplanned work or rework) caused by the failure to do it right the first time[2].
This is the (bad) counterpart to value demand.
I Want You to Cheat, 1992 ↩︎
Failure Demand – Vanguard Consulting Ltd ↩︎