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A Compositional Approach for Validation of Formal Models

A Compositional Approach for Validation of Formal Models . Bojan Cukic, Dejan Desovski West Virginia University NASA OSMA SAS '04. Approach. Using test coverage measures, decompose the formal specification model.

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A Compositional Approach for Validation of Formal Models

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  1. A Compositional Approach for Validation of Formal Models Bojan Cukic, Dejan Desovski West Virginia University NASA OSMA SAS '04

  2. Approach • Using test coverage measures, decompose the formal specification model. • Abstract the thoroughly tested parts, use model checking on the rest of the specification. • Demonstrate that visual interfaces hide the complexity of the specification model. • Develop methodology for creation of visual interfaces. • Use them for representing the coverage metrics too. • Extend the SCR toolset • Monitoring specification test coverage. • Automatic decomposition of the specification. • Compositional verification.

  3. Importance/benefits • Verification and validation of formal models suffers from significant practical drawbacks. • Practical and automated assurance of specifications is an open research problem. • Integration of model testing and visual specification interfaces. • Facilitates variable and interaction abstraction. • Abstractions reducing the state-space of the models. • A compositional framework for verification and validation of system specification models. • Exploit the ease of testing, and the completeness of the model checking. • Extending a mature toolset (SCR).

  4. Relevance to NASA • Incomplete, inconsistent, unstable system requirements a major mission assurance problem. • Brian O’Connor’s address at NASA IV&V, June 04. • Proposed approach to be evaluated on NASA case studies. • Fault Protection Engine (FPE) System at JPL. • Other case studies wanted/needed. • Ongoing case studies on formal specification.

  5. Accomplishments • Test coverage of SCR specification constructs study completed. • Formally defined coverage criteria applicable to SCR specifications. • SCR’s simulator utilized for automated coverage tracking. • Coverage tracking tool developed, applied to Safety Injection System.

  6. Next Steps • Continue the research on SCR specification test coverage, visualization, abstraction, additional case studies. • Develop a methodology for building visual interfaces of generic SCR specifications. • Investigate visual interfaces suitable for specification verification and validation. • Integrate visualization toolset with the coverage tracking tool. • Research on automated specification abstraction from test coverage metrics.

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