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PAS-II, a computer program which represents a generalized version of an automatic protocol system (PAS-I) is described. PAS-II is a task-free, interactive, modular data analysis sis system for inferring the information processes used by a human from his verbal behavior while solving a problem. The output of the program is a problem behavior graph: a description of the subject's changing knowledge state during problem solving. As an example of system operation the PAS-II analysis of a short cryptarithmetic protocol is presented.
Cryptarithmetic, hypothesis formation, model building, natural language processing, problem space, production system, protocol analysis.

D. Waterman and A. Newell, "PAS-II: An Interactive Task-Free Version of an Automatic Protocol Analysis System," in IEEE Transactions on Computers, vol. 25, no. , pp. 402-413, 1976.
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