By Jacob T Schwartz
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It thus turned out that the global aspects of the model are stable, even though the local ones need not be. But since all interpretations were based on these global aspects, local instability was irrelevant. For obvious reasons, it is very important that the cognitive interpretations of a model are not sensitive to small perturbations in the data and thus to the kind of arbitrary decisions that have been exemplified above. In the case of the model for transfer, this stability has been achieved by means of the fact that the Transfer and Quality Indices were computed on the basis of many microworld operations, typically about twenty.
At this stage, more than one rule could match the memory items. To select one of the possible rules, production systems have conflict resolution strategies. The implementation uses the simple conflict resolution strategy, rule ordering, that is, it selects the first of the list of possible rules. In addition, a rule may match more than one memory item. To overcome this problem, the implementation chooses the item that was added last (most recent item) to the memory. (The last action triggers the next action).
Cognitive Theory, vol. 2. Hillsdale, NJ: Erlbaum. Gelman, R. R. (1978). The Child's Understanding of Number. : Harvard University Press. Hennessy, S. (1986). The role of conceptual knowledge in the acquisition of arithmetic algorithms. PhD thesis. University College, London. Modelling Children's Infonnal Arithmetic Strategies 33 Hennessy. , Evertsz, R. : 1989. An intelligent tutoring system approach to teaching primary mathematics. Educational Studies in Mathematics, 20, 273-292. , O'Shea, T.
W-Algebras by Jacob T Schwartz