“Human beings, viewed as behaving systems, are quite simple. The apparent complexity of our behavior over time is largely a reflection of the complexity of the environment in which we find ourselves.”

– Herbert Simon

“I say an hour lost at a bottleneck is an hour out of the entire system. I say an hour saved at a non-bottleneck is worthless. Bottlenecks govern both throughput and inventory.”

– Eliyahu Goldratt

“Successful problem solving requires finding the right solution to the right problem. We fail more often because we solve the wrong problem than because we get the wrong solution to the right problem.”

– Russell L. Ackoff

“Human beings hold two types of theories of action. There is the one that they espouse, usually expressed in the form of stated beliefs and values. Then there is the theory that they actually use; this can only be inferred from observing their actions, that is, their actual behavior.”

– Chris Argyris