All models are wrong, but some are useful.

All models are wrong, but some are useful.

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).

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 old-fashioned idea of a good manager is one who is supposed to know all the answers, can solve every problem himself, and can give appropriate orders to his subordinates to carry out his plans... A good modern manager is like a good coach who leads and encourages his team in never-ending quality improvement.

Remember that all models are wrong; the practical question is how wrong do they have to be to not be useful.