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Waterfall and Agile Quality Techniques. Latha Karri EECS 814 December 9th, 2009. Outline. Agile Methodology XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary. Outline. Agile Methodology

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waterfall and agile quality techniques

Waterfall and Agile Quality Techniques

Latha Karri

EECS 814

December 9th, 2009

outline
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
outline1
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
outline2
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
agile methods
Agile Methods
  • Agility defined:
    • “marked by ready ability to move with quick easy grace”
    • “having a quick resourceful and adaptable character”
  • Emphasis on flexibility in producing software quickly and capably
agile methods continued
Agile Methods (continued)
  • Agile manifesto

Source: http://agilemanifesto.org/

examples of agile methods
Examples of Agile Methods
  • Extreme Programming
  • Scrum
  • Adaptive Software Development
  • Lean Development
  • Evolutionary Project Management
  • Unified Process
  • Crystal
  • Lean Development
  • Dynamic System Development Method
  • Feature Driven Development
outline3
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
xp what is extreme about it
XP- What is Extreme About It?
  • If code review is good, we’ll review code all the time -Pair programming
  • If testing is good, every body will test all the time -Unit testing by developers, functional testing by customers
  • If simplicity is good, we’ll make it part of the system with simplest design that supports its current functionality – Simple design
  • If short iterations are good, we’ll make the iterations really, really short - Small iterations and the planning game
xp what is extreme about it continued
XP- What is Extreme About It?(continued)
  • If integration testing is important, then we’ll integrate and test several times a day – Continuous integration
  • If design is good, we’ll make it part of everybody’s daily business –Refactoring
  • If architecture is important, everybody will work defining and refining the architecture all the time - Metaphor
outline4
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
agile methods twelve facets of xp
Agile Methods: Twelve Facets of XP
  • The Planning Game (customer defines value)
  • Small Release
  • Writing Tests First
  • On-site Customer
  • Pair Programming
  • Sustainable Pace (40 hours/week)
agile methods twelve facets of xp continued
Agile Methods: Twelve Facets of XP (continued)
  • Collective Ownership
  • Continuous Integration (small increments)
  • Simple Design
  • Coding Standard
  • Metaphor (common vision, common names)
  • Refactoring
outline5
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
outline6
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
waterfall quality techniques
Waterfall – Quality Techniques
  • Below screenshot displays the quality techniques employed by waterfall model

Source: Completed Waterfall Process Model (Huo et al. 2004)

outline7
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
agile xp quality techniques
Agile – XP Quality Techniques
  • On-site Customer
    • real, live user on the team, available full-time to answer questions
      • reduces the amount of hard copy documentation
      • and the high cost associated with its creation and maintenance
      • reduces the delay in response time
agile xp quality techniques continued
Agile – XP Quality Techniques(continued)
  • Pair Programming
    • two programmers continuously working on the same code -widely recognized as continuous code inspection
      • improves design quality
      • reduces defects
      • helps to learn from other person
      • coding becomes funs
      • resolution time for some critical problems is much faster
agile xp quality techniques continued1
Agile – XP Quality Techniques(continued)
  • Pair Programming

Source: Costs and Benefits of Pair Programming by Cockburn & Williams

agile xp quality techniques continued2
Agile – XP Quality Techniques (continued)
  • Continuous Integration
    • integrate and build the system several times a day, every time a talk is completed.
      • reduces compatibility issues
      • reduces time in finding the bugs
      • reduces the risk and helps you understand what works and what does not work early on
agile xp quality techniques continued3
Agile – XP Quality Techniques(continued)
  • Test Driven Development
    • programmers write tests first based on user stories (requirements)
      • reduces defects
      • helps to ensure that the application is written for testability
      • improves design quality
      • ensures that tests for every feature will be written
      • gives confidence to the developers
agile xp quality techniques continued4
Agile – XP Quality Techniques(continued)
  • Sustainable Pace \ 40 hr work week
    • programmers work 40-45 hr per week
      • helps to produce high quality code in less time
      • helps the programmers to be healthy and happy
outline8
Outline
  • Agile Methodology
    • XP- What is Extreme About It?
    • Agile Methods: Twelve Facets of XP
  • Waterfall – Quality Techniques
  • Agile – Quality Techniques
  • Summary
summary
Summary
  • Agile methods generally promote a disciplined project management process that encourages frequent inspection and breaks tasks into small increments with minimal planning
  • XP took common practices to the an extreme level by doing them more frequently
summary continued
Summary (continued)
  • Moving forward, we discussed the quality aspects of waterfall model
  • Finally, concluded with the agile quality techniques as addressed by test driven development, on-site customer, continuous integration, pair programming and sustainable pace
references
References
  • http://www.agiledeveloper.com/presentations/AgileMethodologies.pdf
  • Huo, M., Verner, J., Zhu, L., & Babar, M. A. (2004), “Software Quality and Agile Methods”, Proceedings of the 28th IEEE Annual International Computer Software and Applications Conference, pp. 520-525 Washington, DC
  • http://aswec07.cs.latrobe.edu.au/12.pdf
references continued
References (continued)
  • http://aswec07.cs.latrobe.edu.au/12.pdf
  • http://people.eecs.ku.edu/~saiedian/Teaching/Fa08/810/Lectures/PA-ch02.pdf
  • http://collaboration.csc.ncsu.edu/laurie/Papers/XPSardinia.PDF
  • Discipline vs Agility report by Jason Cradit
  • http://www.orlandojug.org/XP_Methodology_overview_v3a.ppt#276,31,XP > Pros