This thesis describes an experimental study with workgroups.The experiment focused on teams' observation, each team formed by business administration undergraduates, who acted in a simulated business environment.The simulation was based in individuals' performance, organized in different workgroups, and working as simulated companies that were directed to compete against each other.During the process, teams were required to analyze their companies' external environment, available resources in their organizations, and competitors' performance, in order to make necessary decisions to reach the best possible results for the company.A great concern in this study was concentrated in identifying possible impacts that people's behavior have in their performances at work, when joined in workgroups, specifically regarding the strategic decision making process, one of the biggest professional requirements for managers.This study also looked for to verify if a training model developed to enhance aircraft crew decision making process, was capable to influence teamwork's behavior in a business environment, improving the quality of the team decision making process and, consequently, producing better results for the organization.Finally, this study presents and make comments on the results of the experiment that, opposing to the common sense, didn't confirm that the behavioral aspects of the persons involved have an impact on the workgroups' performance.This study neither confirmed the effects from the training model in the improvement of the workgroups' decision making process, subject of this experiment.