EACH DISCUSSION OF HOW TO APPLY Piaget exemplifies his principles. That is because Piaget has an abstract system, and there are innumerable ways to assimilate it to other disciplines and accommodate them to his.

As Dr. Tenzer says, assimilation and accommodation go together. And it follows that Piaget will leave no preconceptions unscathed, just as surely as everyone will make Piaget say what he wants him to say. Therefore, since Dr. Tenzer is supremely lucid and accurate in her exposition, the only question for a discussant is whether he would have used Piaget the same way. Agreements will show like-mindedness, and differences will be matters of preference.

For example, at the most general level, Dr. Tenzer wants to use Piaget to make psychoanalytic principles less vague, whereas I have always thought it would be more fruitful to use Piaget to clarify treatment. What is the difference? Treatment is a phenomenon