Diploma thesis deals with the process of optimizing the material flow in a manufacturing company. The critical path of project is found through the stochastic method of Program Evaluation and Review Technique (PERT). On the whole process is compiled simulation in the program Technomatix Plant Simulation as an alternative method for evaluation of the project. Both methods are built into confrontation and are set out proposals for possible solutions to optimize processes and their evaluation. Thesis is prepared on the basis of literature dealing with the topic, based on internal company resources and expertise of the author internal company processes.