This study investigates a number of variables related to decision support systems (DSS): use of systems, contribution of systems, and user satisfaction. We use a simulation game as a vehicle for implementing DSS and for measuring the effectiveness of those systems. Fifty-Eight companies, consisting of about 300 senior graduate students participating in the simulation, developed DSS and reported on the systems developed. Questionnaires were later used to evaluate the results. Findings, consistent with previous empirical studies, strengthen the validity of the simulation exercise as a useful tool for measuring DSS effectiveness.