Multitasking is defined as conducting several tasks simultaneously. There are three characteristics of multitasking. First, multitasking has circular characteristic and demand the performance of several tasks. Second, there is a shift of attention from one task to another. Third, the performance happens in limited time. Many companies apply multitasking to make their human resources more effective and efficient. If this proficiency can be predicted, companies will be able to reduce their expenses by appropriate selection or potential review to their human resources particularly in Indonesia. Therefore, this study attempted to create computerized simulation program as the measurement methods of multitasking performance. Simulation have reflected the real situation by: the existence of various types of matter in the three sets of tasks that must be done within a certain time limit, the subject can move or choose task that they want, and the presence of dual task. Measurement conducted in a quiet room, adequate temperature and lighting, and adjustable workstation. The result of this study built practical implication that the multitasking performance measurement method by using computerized simulation could create the multitasking condition. Therefore, companies or industrial practitioners can use the simulation method to measure the multitasking proficiency of their employees.