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OSMA SAS 08 Infusion of Perspective-Based Inspections for NASA IV&V (Executive Briefing). Dr. Forrest Shull, FCMD Kurt Woodham, L-3 Communications. Perspective-Based Inspection (PBI). A procedural technique incorporating three best practices:

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osma sas 08 infusion of perspective based inspections for nasa iv v executive briefing

OSMA SAS 08Infusion of Perspective-Based Inspections forNASA IV&V(Executive Briefing)

Dr. Forrest Shull, FCMD

Kurt Woodham, L-3 Communications

MAC-T IVV-08-153

perspective based inspection pbi
Perspective-Based Inspection (PBI)
  • A procedural technique incorporating three best practices:
    • Giving each reviewer a particular and unique focus (or perspective) on the document under review
      • Base perspectives on document stakeholders to help understand necessary participants, relate inspection tasks to development skills
    • Making individual review of a document an active (rather than passive) undertaking
    • Articulating the quality aspects of interest
  • Uses defect analysis (e.g. from bug trackers, configuration management systems, previous inspection, or test results) as one input on which to customize a solution

MAC-T IVV-08-153

perspective based inspection pbi1
Perspective-Based Inspection (PBI)
  • History
    • 2001-2003: SARP research funding
      • Refined basic approach, implemented on NASA projects and in classrooms, measured results
    • 2004: Tech infusion with Flight Software Branch / GSFC
      • Goal: Produce new Branch standards
      • Success metric: Based on experiences on pilot(s), how much of the recommended process is adopted by Branch?
    • 2004: Tech infusion with United Space Alliance / JSC
      • Goal: Reduce defect slippage over current increment
      • Success metric: Show reduced defect slippage on PB-inspected artifacts
    • 2007-2009: SARP funding for improved general inspection planning
  • Other Results and Benefits
    • Improved defect detection effectiveness substantially (NASA & elsewhere)
    • Helped re-invigorate inspection practices
    • Forms the basis of industrial and academic training

MAC-T IVV-08-153

adopting pbi for iv v
Adopting PBI for IV&V
  • Tailoring required for new domain, new issues, new artifacts

Requirements Specifications

System reference model

PB Inspection

PB Inspection

Requirements defects

Model defects

MAC-T IVV-08-153

adopting pbi for iv v tailoring process
Adopting PBI for IV&V: Tailoring Process
  • Understand team-specific quality concerns
  • Understand likely perspectives for the team
  • Refine set of perspectives and define procedures for each. E.g.,
    • What quality concerns map to which perspectives
    • What is a feasible/effective process for checking those concerns
  • Finalize procedures and provide training
  • Analyze ongoing inspection results (and update procedures if necessary)
  • Monitor downstream defect profile
  • Write final report

Status: Reviewed sample models & processes; Constructed draft PBI techniques; Created draft training course

MAC-T IVV-08-153

adopting pbi for iv v1
Adopting PBI for IV&V
  • Initial perspectives for this domain:
    • Modeler
      • Uses requirements & existing models to create the next iteration
      • Quality foci: Appropriate level of detail in requirements; completeness and clarity of requirements & models; consistency and correctness of models
    • Domain expert
      • Assesses whether model accurately and usefully captures domain
      • Quality foci: Correctness of requirements (independent of models); identification of stakeholders and evaluation of usability from their POV; checking flow of control & use of reusable components
    • Quality assurance
      • Assesses whether models and system can be validated properly
      • Quality foci: Handling of exception cases / unexpected system conditions; robustness of system; testability

MAC-T IVV-08-153

path forward
Path Forward
  • Validate & refine PBI instantiation via interviews
    • Check perspectives and associated scenarios with key stakeholders
    • Flesh out detailed approaches for each perspective with respect to each defect category
  • Application
    • In context of IV&V of JWST
    • Training course material delivered and training will be executed near-term
    • Technology provider will facilitate initial inspections, and will be on-call during subsequent inspections
  • Evaluation
    • Success metric: Effectiveness of PB inspection in comparison to past inspections

MAC-T IVV-08-153

contact information
Contact information

Forrest Shull

[email protected]

301-403-8970

Kurt Woodham

[email protected]

757-644-5807

MAC-T IVV-08-153

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