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Architectural engineering of embedded systems comprehensively affects both the development processes and the abilities of the systems. Verification of architectural engineering is consequently essential in the development of safety- and missioncritical embedded system to avoid costly and hazardous faults. In this paper, we present the Architecture Quality Assurance Tool (AQAT), an application program developed to provide a holistic, formal, and automatic verification process for architectural engineering of critical embedded systems. AQAT includes architectural model checking, model-based testing, and selective regression verification features to effectively and efficiently detect design faults, implementation faults, and faults created by maintenance modifications. Furthermore, the tool includes a feature that analyzes architectural dependencies, which in addition to providing essential information for impact …