The diploma thesis focuses on the problematics of setting the number of employees in the selected department (team) in a specific company. With respect to the severity of impact of this decision, the diploma thesis choses a sophisticated tool, norms of work consumption. To simplify their utilization a model is created to specify the number of employees. The basis for construction of the model is summarized in the theoretical-methodological part. Practical part of the diploma thesis presents the company, the department and the team and it defines preformed processes. Furthermore, it calculates (determines) individual elements needed for building the required model, namely the time normatives (norms) of the activities, probabilities of occurrence of certain activities and usable time fund of an employee. Lastly, the created model is tested by using real data from the last period and consequent recommendations are presented.