Discovering the unexpected is more important than confirming the known.

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.

All models are approximations. Essentially, all models are wrong, but some are useful. However, the approximate nature of the model must always be borne in mind.

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

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.

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

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