ABSTRACT
The most fundamental problem confronting cognitive psychology today is how to represent theoretically the knowledge that a person has: what are the primitive symbols or concepts, how are they related, how are they to be concatenated and constructed into larger knowledge-structures, and how is this "information file" to be accessed, searched, and utilized in solving the mundane problems of daily living. The choice of a representation is central, since how one handles this issue causes widespread effects throughout the remainder of his theoretical efforts. As computer scientists working on problem solving have known for years, a good structural representation of the problem already constitutes half of its solution (see Amarel, 1968).
