This project was designed to construct a single theoretical framework for the analysis of problem solving and real time "attention and performance" behavior. The model was developed as a computer program. It was designed in a similar manner to that of various problem solving simulations that use the "production system" approach. The program has been used to simulate results from choice reaction time, stimulus repetition, dual channel monitoring, and conflicting stimulus (Stroop) paradigms. Several questions arose during development of the model concerning human performance in situations requiring attention allocation. Experiments were conducted that indicated the mediation of attention allocation by stimulus frequency occurred through the automatic processing system. However, attention allocation mediated by warning signals occurred through the controlled processing system. Further studies suggested that individual differences in the ability to control attention were specific to a stimulus modality, rather than to a generalized ability to control attention. The theoretical framework developed and described here has been used as an integrative device to order the literature on individual differences in cognition, verbal comprehension, and techniques for assessing an individual's ability to memorize and recall information. (Author/DWH)