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Enhancing IV&V Techniques for OO Software Systems: Executive Briefing 2004

This briefing outlines the problem, approach, importance, and accomplishments of Independent Verification and Validation (IV&V) Techniques for Object-Oriented (OO) Software Systems, as discussed at the SAS meeting in July 2004. The document covers the unique challenges and risks related to applying IV&V to OO systems, the developed IV&V techniques including use cases and state transition diagrams, the benefits of improved UML artifact analysis and maturity estimation, and the relevance of these techniques to NASA projects such as JWST and HDS. Accomplishments in evaluating IV&V techniques for OO models, including a probabilistic framework for assessments, and next steps for refining IV&V processes and models are also highlighted.

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Enhancing IV&V Techniques for OO Software Systems: Executive Briefing 2004

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  1. Independent Verification and Validation (IV&V) Techniques for Object Oriented Software Systems SAS meeting July 2004 Executive Level Briefing

  2. Outline • Problem • Approach • Importance/benefits • Relevance to NASA • Accomplishments • Next steps

  3. Problem Statement • NASA has considerable experience applying IV&V to traditional function-based software systems • Emerging use of OO brings unique challenges and risks • There is a need to develop IV&V techniques for addressing these risks

  4. Approach • Risks identified • Management, technical, process • Developed base set of IV&V Techniques • Use cases, class diagrams, state transition diagrams • Applied & evaluated techniques on the use cases based on a NASA example • Data for BBN, A set of use cases processed using the proposed approach

  5. Importance / Benefits • Improved analysis of UML artifacts • Framework for use cases, classes, state transition diagrams • Method for prioritization of UML artifacts • Analysis techniques for the artifacts (consistency, completeness, traceability) • Better maturity estimate during SSR, PDR, CDR • At present maturity estimate is based on “expert opinion” • BBN will allow for the use statistical methods to measure the completeness level of inputs to the milestone reviews

  6. Relevance to NASA • More NASA systems are using object oriented approach • JWST, HDS, …. • NASA IV&V needs better techniques to support milestone reviews • Use of BBN • Improved process model

  7. Accomplishments • Techniques for OO models • Evaluated current & emerging OO IV&V techniques • Identified Risks with OO development • Investigated framework for OO IV&V • Developing base set of IV&V techniques for Use cases, Class diagrams, State diagrams • ISSRE 2003 “IV&V of OO software systems” • BBN based maturity estimate during SSR • ISSRE 2004 “A Probabilistic Framework to Support Independent Assessment of Use-Case Based Requirements Specifications” • NASA project example analysis

  8. Next Steps • Process model • Developing Use case IV&V process model • Use case IV&V workflow • Need to refine further the IV&V steps for use case analysis • Improved BBN models • Basic BBN model is ready and submitted to a conference • Extend the IV&V models to other phases • Near term-process model for the analysis of class diagram, state transition diagrams • Longer term- BBN models for the class diagram, state transition diagrams

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