In our research project, a simulated teammate was used to determine the effectiveness of tank simulator training for individual task aspects. This tank simulator was built to teach a crew how to use an Armoured Air Defence tank called "Cheetah". In this tank, a team of two crewmembers carries out the necessary actions. Besides teamskills, they both need a basic amount of individual skills to work effectively as a team. To obtain those skills, students are trained in different team combinations each lesson. During the normal training program, students' individual skills are evaluated by looking at the team results. Our project aimed at measuring the individual skills of a crewmember separate from the team results. We considered two options to measure the skills individually; the first option used speech recognition and the second a computer-simulated teammate to work together with a student during the test in the simulator. After testing, we selected the second option in order to obtain objective individual results on skill acquisition. A number of trials with the selected option showed that the students reacted positively to the new test and that the objectivity of the test was considerably improved. Individual differences became clear and the need for extra training could be determined more precisely. Further research issues are discussed in the paper.