One important idea is that science is a means whereby learning is achieved, not by mere theoretical speculation on the one hand, nor by the undirected accumulation of practical facts on the other, but rather by a motivated iteration between theory and practice.

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

All models are wrong, but some are useful.

One important idea is that science is a means whereby learning is achieved, not by mere theoretical speculation on the one hand, nor by the undirected accumulation of practical facts on the other, but rather by a motivated iteration between theory and practice.

The business of the statistician is to catalyze the scientific learning process.

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