A Rework Loop is a situation where a step in a process is repeated in order to correct a defect; also known as backtracking. Rework Loops are work that must be done over and over. They often become an accepted part of the process as people get used to them over time. To find Rework Loops, look for places where large amount of work move back in the process to be fixed.
Rework Loops are Non-Value Adding Activities and are undesirable, as they add to cost and cycle time.