One derives psychological events by tracing them back to the dynamic relation in which they have their source. This "tracing back" and the concept of causation which is implied in doing so are understood in very different ways in psychology.The question "why" can have two very different meanings in psychology.Cf K. Lewin (59). The same confusion of the two kinds of concepts has been no less of a handicap in other early periods, e.g., of economics and history of art.

It is our hope that the results of these investigations will contribute to a more definite understanding of the problems confronting deaf children and that they may contribute to the improvement of instruction.

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