Value-Based Software Quality Achievement Process Modeling
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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


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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

©USC-CSE


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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

©USC-CSE



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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

©USC-CSE


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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


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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

©USC-CSE


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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

©USC-CSE


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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 Generator– Based on VBSQA-OPN Model

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VBSQA Process Creator – Creating an ERP VBSQA Process Instance

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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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VBSQA Process Simulator– ROI of Synchronous Stakeholder Interaction Activities

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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

©USC-CSE


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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


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Backup Slides

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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


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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

©USC-CSE


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