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Model-based approaches can improve quality and reduce cycle time by simulating the models to perform early validation of requirements. These approaches can provide automated validation techniques by generating test cases from the model. This paper describes model-based automated test techniques in all phases of the product life cycle to maximize the early validation capabilities of model-based development processes. The paper proposes a model-based test process framework for all modeling phases including system modeling, architectural modeling and auto-generated software. The test automation technique consists of automatic test generation, execution and analysis. A Test Management System, which enables the automatic generation of requirement-based test cases, analysis of the test results and test database management, is developed through this study.