Why, in addition to tradeoffs, do we need another contradiction? First, the formulation of the inherent contradiction helps to get the best solutions because it helps find the key problem. There are always many problems and tradeoffs, but not all problems are equally important. One problem is key. The solution of this problem leads to the solution of others. Recall the fast food example in the beginning. Old drive-in restaurants had many problems and tradeoffs: slow service, high costs, uneven quality, not always the best reputation, and others. The whole bundle of drawbacks resulted from one inherent contradiction: the restaurant needed many service people, and it needed very few service people.