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Value-Based Software Quality Achievement Process Modeling. LiGuo Huang [email protected] Computer Science Department Andrew & Erna Viterbi School of Engineering University of Southern California February 16, 2006. Outline. Value-Based Software Quality Achievement (VBSQA) Process

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Value-Based Software Quality Achievement Process Modeling

LiGuo Huang

[email protected]

Computer Science Department

Andrew & Erna Viterbi School of Engineering

University of Southern California

February 16, 2006

©USC-CSE

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Outline
  • Value-Based Software Quality Achievement (VBSQA) Process
  • Experience of Applying VBSQA Process
  • VBSQA-OPN Model
  • VBSQA Process Generator
  • Conclusions and Future Work

©USC-CSE

real world software quality achievement
Real-World Software Quality Achievement
  • Heterogeneous group of stakeholders with different (sometimes even conflicting) quality perspectives
  • Developing a process for software quality achievement needs to address the following problems
    • Quality (Q-) attributes are not neatly orthogonal or independent
    • Same stakeholder’s strengths of dependencies on Q-attributes even vary in project development life cycle
    • A flexible process is expected in real-world application

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research question
Define

Mission-specific

combinations of

quality (Q-)

attributes

Negotiate

Stakeholders

Develop

Monitor and Control

Research Question

Value Propositions

Value-Based Metrics

Process

Value-Based Models

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characteristics of vbsqa process
Characteristics of VBSQA Process
  • Identify value conflicts on Q-attributes through risk analysis, architecture/technology evaluation and milestone reviews
  • Resolve conflicts by performing tradeoff analyses
  • A great deal of concurrency and backtracking
  • Achieve stakeholder WinWin-balanced software quality requirements

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application of vbsqa process
Application of VBSQA Process
  • USC/NASA Inspector SCRover project
  • Real-world Enterprise Resource Planning (ERP) software development in China (DIMS upgrade project in Neusoft)
    • A variety of stakeholders with different value propositions
    • Product lines are maintained as a basis for future upgrades
    • Three process patterns: deadline-driven, product-driven, market-trend driven
    • Different software quality assessment criteria and different software development activities are adopted in different process patterns.

©USC-CSE

experience of applying vbsqa process
Experience of Applying VBSQA Process
  • Two week tutorials on VBSQA Process and WinWin Spiral Model
    • Developed a process instance composed of 22 ERP software development activities
      • 6 misplaced activities due to misinterpretation
      • 4 missing activities
  • Feedback from project managers of ERP solution providers
    • Shorten the new process learning curve
    • Maintain the flexibility of the process
    • Identify the flaws in a process instance
    • Tradeoffs among conflicting software Q-attributes
    • Determine stakeholders’ perspectives and interaction points

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model vbsqa process using object petri nets opn
Model VBSQA Process Using Object Petri Nets (OPN)
  • Inherit the merits of Petri Nets (PN)
    • Formal semantics despite the graphical nature
    • State-based instead of event-based
    • Abundance of analysis techniques
    • Model concurrent process activities
  • Support separation of concerns among various stakeholders’ perspectives
    • Object-oriented approach
    • Model VBSQA Process Framework as the System Net (SN)
    • Model each stakeholder’s process instance in a separate Object Net (ON)
      • Process activities in ONs are inherited from process steps/milestones in SN
    • Interaction/negotiation among stakeholders and the SN/ON synchronization can be defined later

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formal definitions of vbsqa opn
Formal Definitions of VBSQA-OPN
  • An OPN is a 3-tuple
    • System Net: is a Petri Net with its tokens referring to Object Nets
    • Object Nets: (n>1)
    • SN and ONs synchronize via “channels” ρ
  • VBSQA-OPN =
    • System Net: , VBSQA Process Framework or its tailoring
    • Object Nets: (n>1) represents a set of process instances of stakeholders,
    • Synchronization relation between SN and ONs:
    • , a mapping between VBSQA process framework steps/milestones and ERP software development activities.
    • Guard functions: activation condition(s) of transitions
    • Constraint 1: Inheritance of chronological order
    • Constraint 2: Critical Path Dependency

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vbsqa process checker identifying the flaws in a vbsqa process instance
VBSQA Process Checker– Identifying the Flaws in a VBSQA Process Instance
  • Maintain the flexibility of the process
    • Allow project managers to inherit a NULL activity from each step in the SN (VBSQA process framework)
      • Introduce the flaws of missing activities to violate critical path activity dependencies
  • VBSQA Process Checker
    • Formal properties defined in the VBSQA-OPN System Net (SN) and implemented in the VBSQA Process Checker
  • Examples of the activity dependency constraints in the SN
    • SCS define acceptable & desired values for Q-attributes must be completed before Risk analysis & architecture/technology evaluation
    • Risk analysis & architecture/technology evaluation must be completed before System top-level design
    • System top-level design must be completed before LCO Review

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modeling costs and benefits
Modeling Costs and Benefits
  • Costs
    • Mutual learning: 24 hrs (3 days)
    • Developing plan: 2 hrs (DIMS upgrade project)
    • V&V of plan: 4 hrs (DIMS upgrade project)
    • Improving plan: 3 hrs (DIMS upgrade project)
  • Benefits
    • Time, effort saved: total 66 hrs in DIMS upgrade project
      • Mutual learning: 56 hrs (= 80 hrs - 24 hrs)
      • Developing plan: 6 hrs (= 8 hrs - 2 hrs)
      • V&V of plan: 4 hrs (= 8 hrs - 4 hrs)
    • User satisfaction:
      • More confident in generated project plans
      • Simulation results are very helpful in optimizing project plans
      • Easy to learn

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conclusions and lessons learned
Conclusions and Lessons Learned
  • Value-Based Software Quality Achievement (VBSQA) process
    • helps in achieving stakeholder WinWin-balanced project quality outcomes
  • VBSQA-OPN model: synchronized and stabilized the activities, value propositions, and commitments of multiple success-critical stakeholders.
  • Process visualization and simulation tools significantly increased management visibility and controllability
  • OPN provides a feasible solution to the value-based process modeling
  • Future work: more simulations on VBSQA Process Generator

©USC-CSE

slide17
Backup Slides

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vbsqa process creator map erp software development activities into vbsqa process framework
VBSQA Process Creator– Map ERP Software Development Activities into VBSQA Process Framework
  • Objectives:
  • To shorten the VBSQA process learning curve
  • To reduce the flaws such as the misplacement of ERP development activities due to the misinterpretation of the process steps when creating a process instance
  • To adapt to the changes in ERP software development activities and/or workflows

©USC-CSE

vbsqa process simulator
VBSQA Process Simulator
  • ROI of Synchronous Stakeholder Interaction Activities
    • ROI = (Value – Cost)/Cost
    • Value:
  • V: the total value of the project;
  • Eij (0-1): the effectiveness of a specific process activity on mitigating
  • the risk of Q- attribute i if it is performed in phase j;
  • Ri (0-1): the risk of Q-attribute i to the total value of the project.
    • Cost = Activity Cost + Rework Cost
  • Various combinations of synchronous stakeholder interaction activities and developer internal activities

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