Just as the ability to devise simple but evocative models is the signature of the great scientist so overelaboration and overparameterization is often the mark of mediocrity.

To find out what happens to a system when you interfere with it you have to interfere with it (not just passively observe it).

Management must provide employees with tools that will enable them to do their jobs better, and with encouragement to use these tools. In particular, they must collect data.

The benefits provided by worker participation are twofold. Quality is improved because of the finding and fixing of a very large number of problems, but also, and perhaps equally important, moral is improved.

Statisticians, like artists, have the bad habit of falling in love with their models.

The only way to know how a complex system will behave-after you modify it-is to modify it and see how it behaves.

The management system which makes only a pretense of valuing employee involvement and encouraging employee empowerment merely breeds cynicism.