P PT Bina Busana Internusa is an Indonesian garment company that produces wear pack and shirt brands, such as Valino, Van Hausen, and Harry Martin. By the month of March 2012, The company was targeting to produce 2976 items of the Valino long sleeve type shirt, 340 items of the Valino short sleeve type shirt, 1340 items of the Van Hausen long sleeve type shirt, and 625 units of the Harry Martin shirt. According to the production plan, all of the type of shirts is set to be completed per week. However, the target could not be achieved because the actual production number is way less than the target. For that reason, the purposes of this final project are to evaluate the company\'s garment production process and to give a proposal of idea in order to repair the production system, up to the production\'s target could be achieved finally. To facilitate the problem solving, a simulation by using SimRunner software is considered to be utilized within the research. The simulation is concerning to the production process evaluation use, as well as the SimRunner for giving the optimum solution.In a production system, there are three types of variable, they are input variable, decision variable, and respond variable. The cycle time of production activity is declared as the input variable in the production system. The workforce factors as the quantity of the machine and operators are declared as the decision variables. The dependent variable in the system is the quantity of shirts. The simulation running has the result output of each type of shirt, as they are 2595 items of the Valino long sleeve type shirt, 239 items of the Valino short sleeve type shirt, 1165 items of the Van Hausen long sleeve type shirt, and 579 units of the Harry Martin shirt. This simulation programming uses SimRunner as the tool to assist and to ensure the optimum output of the indicators that have been triggering problems along the production activities. By simulating the SimRunner, it is identified that performance repair in the division of cutting is urgently needed. The division of cutting is a part of whole production system, which is originally occupied by 13 operators and 3 machine. The identification is given as the SimRunner reported the best 5 suggestions among 78 experiments that have been done. The main idea of the five suggestions are to place the operators and the machine in proper number. A Bonferroni test is applied on each of new models to ensure how far the suggested models affected the production. The Bonferroni test of the five suggestions gives the idea of no. 2 as the best recommendation to be applied on the cutting division of PT Bina Busana Internusa.