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As presented in Figure 1 our approach to analyze the costs and benefits of model-based development consists of five steps. First of all a theory, which summarizes assumed changes in costs, time and quality because of model-based development was developed. The idea behind the theory is to analyze major differences between a hand-coded and a model-based development process. Therefore a couple of hand-coded and model-based development processes, which are used by car manufacturers and suppliers, were analyzed. As a result we developed a reference process for a classical software development and a reference process for a model-based software development. These two reference processes were compared and major differences were identified. To...