Sim-ACTS is an agent-based computer simulation model of some aspects of ACTS theory 5]. It is the rst of a series of models in which increasingly more aspects of ACTS theory will be encompassed. Sim-ACTS studies the eeects of communication and organizational structure on organizational problem solving. It is a follow-up study of the TASSCS research project 15],,16]. The simulation experiments from the TASSCS project are replicated using the Sim-ACTS model.The article compares the results of TASSCS' simulations with those of the Sim-ACTS experiments. Sim-ACTS is implemented in SOAR 8], the implementation of a general cognitive theory 11].