Table 192

Marr's (1982) framework for theories

Computational level The goal of the computation, why it is appropriate, what the logic of the strategy carried out might be.

Algorithmic level How can the computational theory be implemented, the representation for the input, and the algorithm for the transformation. Hardware level_How can the representation and the algorithm be realised physically._

of representations and algorithms that can actually be used. A crucial point is that "a complete psychological explanation of any task performance must invoke all three levels of analysis" (Oaksford, 1994, p. 76). The research discussed in this book has made substantial progress in this direction. However, complete psychological explanations still lie in the future.

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