This paper addresses the influence of individual and group information feedback on a decision process supported by the application of a system dynamics model. For this purpose, we have conducted the four-group Solomon experiment under following conditions: a1) determination of strategy with application of the system dynamics (SD) model without group interaction with pretest, a2) determination of strategy with application of the SD model and group information feedback with pretest, a3) determination of strategy with application of the SD model without pretest, and a4) strategy determination with application of the SD model and group information feedback without pretest. The observed variables were the criteria function values and frequency of simulation runs. The hypothesis that simulation model application and group feedback information positively influence the convergence of the decision process and contribute to faster decision-making was confirmed. A model of learning during the decision-making process was developed.