Why Lean Changes Don’t Sustain

The “7 Wastes of the Toyota Production System” are well-known, and include wastes like over-production, transportation, waiting, and excess inventory. But what about the waste of failing to sustain process improvements? In addition to failing to keep the benefits achieved, there is the additional waste of all of the time and effect previously invested. This is like signing up for an expensive weight loss program, losing the weight, and then gaining it all back again.