The most significant source of waste is overproduction. . . . [which] results in shortages, because processes are busy making the wrong things. . . . you need extra capacity because you are using some of your labor and equipment to produce parts that are not yet needed.
Mike Rother and John Shook1
1. Mike Rother and John Shook, Learning to See: Value-Stream Mapping to Create Value and Eliminate Muda (The Lean Enterprise Institute, 2003), p. 43.
In Rother and Shook’s Learning to See, they seek to teach how to recognize sources of waste. As humans, we become so conditioned to our environment and the way things have always been done that we are often blind to opportunities for improvement. ...