PDP (Protocol Diaqnostic Program) is a proqram for analyzing think-aloud protocols of subjects solvinq elementary physics problems. Two versions of PDP implement models of problem solving behaviour at novice and intermediate levels of expertise. In order to compare the behaviour of the models with think-aloud protocols of subjects, PDP is equiped with a think-aloud component, which communicates with a human coder. Any discrepancies between the behaviour of the model and the subject activate a diaqnostic component, which identifies the deviation and may redirect the behaviour of the model. The output of the system is an analysis of a protocol in terms of the computational model, annotated with possible discrepancies between model and subject. Results obtained by analyzing a number of protocols of experts and novices are presented.
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