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Active Review for Intermediate Designs [Clements, 2000]. Introduction . A piloted software design review technique A blend of stakeholder-centric, scenario-based, architecture evaluation method (ATAM and ADR) Goal: expose design to allow early feedback Designers want:

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Presentation Transcript
introduction
Introduction
  • A piloted software design review technique
  • A blend of stakeholder-centric, scenario-based, architecture evaluation method (ATAM and ADR)
  • Goal: expose design to allow early feedback
  • Designers want:
    • To know if the design is tenable
    • To unveil the design to the community of software writers
benefits
Benefits
  • Provides valuable insight into design’s viability
  • Allow for timely discovery of errors, inconsistencies, or inadequacies
active design reviews adr
Active Design Reviews (ADR)
  • Effective technique for ensuring quality, detailed designs in software [Parnas, 85]
  • Actively engaging reviewers to utilize the design in a series of exercises
  • Conventional design review:
    • Examine stacks of documentation
    • Checklist to ensure design meets certain standards
slide6
ADRs evaluate detailed designs of modules
  • Questions address:
    • Quality and completeness of documentation
    • Sufficiency, fitness, and suitability of the services provided by the design
architecture tradeoff analysis method atam
Architecture Tradeoff Analysis Method (ATAM)
  • A scenario-based design review techniques
  • Scenarios proven to be valuable in the evaluation of system and software designs
  • Relies on the present of the stakeholders
  • Elicits business goals for system and its architecture
  • Uses those goals and stakeholder participation to focus attention to key portions of the architecture
benefits of atam
Benefits of ATAM
  • Benefits:
    • Financial gains
    • Forced preparation
    • Captured rationale
    • Early detection of problems
    • Validation of requirements
    • Improved architecture
example utility tree
Example Utility Tree

Transaction response time (H, M)

Performance

Throughput

150 transactions/sec

Training

Usability

Utility

Normal operations

Database vendor releases

new version

Maintainability

slide11
ARID
  • ADR/ATAM hybrid
  • ADR requires active reviewer participation
  • ATAM embraced stakeholder-generated scenarios
  • Three groups of participants:
    • ARID review team (facilitator, scribe, process observer)
    • Lead designer
    • Reviewers (stakeholders)
phase one
Phase One
  • Phase 1: Pre-meeting (between lead designer and facilitator)
    • Identify reviewers
    • Prepare design presentation
      • Facilitator ask “first order” questions
      • Identify areas to improve presentation
      • Set the pace for the presentation
      • A practice to the designer
phase one 2
Phase One … (2)
  • Prepare seed scenarios
    • Designer and facilitator prepare sample set of scenarios
    • E.g. a user in a particular context asks for help, and the system provides help for that context.
  • Prepare for the review meeting
    • Produce copies of presentation, seed scenarios, and review agenda
phase two
Phase Two
  • Phase 2: Review Meeting
    • Present ARID method (30 mins by facilitator)
    • Present design (no questions nor suggestions allowed except on factual clarification)
      • Scribe jots down every questions
    • Brainstorm and prioritize scenarios
    • Perform review
      • Provides pseudo code to solve problems posed by the scenario
    • Present conclusions
output of arid
Output of ARID
  • Initial Architecture
  • System overview from a business perspective:
    • Most important functions
    • Any relevant technical, managerial, economic, or political constraint
    • Business goals that relate to the project
    • Major stakeholders
    • Major quality attributes
  • Set of seed of scenarios
output of arid 2
Output of ARID … (2)
  • Set of scenarios and their prioritization from the brainstorming
  • The Utility Tree
  • Issues and problems