This paper puts forward a new method for model-based development of fault tolerant systems of systems. The method covers early architectural design, formal modelling and verification. The focus is on supporting modelling techniques that ensure systematic and structured reasoning about faults, error detection and fault and error recovery. The method combines semi-formal modelling in SysML with formal modelling and verification conducted in CSP. The work is part of the EC COMPASS Integrated Project on Comprehensive Modelling for Advanced Systems of Systems<sup>1</sup>.
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