Column WIP limits… … are a waste of effort and resources. Because only one column can be the constraint, it follows that the majority of interventions (on the other columns!) are actually wasted. “Fixing” a non-constraint is waste...
Column WIP limits… … introduce artificial bottlenecks where there should not be any. This is quite perverse. Referring to the story of Herbie, in Goldratt’s “The Goal”, it is as if we were loading the backpack of the boy in fro...
Column WIP limits… … divert focus away from the real constraint, and divert attention away from the throughput of the entire system. Without the right focus, there is no leverage. Quoted from: Tame the Flow.
Column WIP limits… … induce tampering with the system. Tampering was defined by Deming as a waste of productive time that causes loss of focus. Playing with column WIP limit is a waste of time. Quoted from: Tame the Flow.
Column WIP limits… … promote excessive trial and error. Practitioners are recommended to “play with the column WIP limits” to find out what works. Rather than measuring the effects in terms of throughput of the whole system and decid...
Column WIP limits… … give too many false positives of problems that are not really problems, but are “problems” that have been self-inflicted by the very act of setting the column WIP limits. Do not hurt yourself! Quoted from: T...