Waterfall and Agile Quality Techniques Latha Karri EECS 814 December 9th, 2009

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

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 9/17/2018

Agile Methods (continued) Agile manifesto 9/17/2018 Source: http://agilemanifesto.org/

Examples of Agile Methods Extreme Programming Scrum Adaptive Software Development Lean Development Evolutionary Project Management Unified Process Crystal Dynamic System Development Method Feature Driven Development 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

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 9/17/2018

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 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

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) 9/17/2018

Agile Methods: Twelve Facets of XP (continued) Collective Ownership Continuous Integration (small increments) Simple Design Coding Standard Metaphor (common vision, common names) Refactoring 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

Waterfall – Quality Techniques Below screenshot displays the quality techniques employed by waterfall model 9/17/2018 Source: Completed Waterfall Process Model (Huo et al. 2004)

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

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 9/17/2018

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 9/17/2018

Agile – XP Quality Techniques (continued) Pair Programming Source: Costs and Benefits of Pair Programming by Cockburn & Williams 9/17/2018

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 9/17/2018

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 9/17/2018

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 9/17/2018

Outline Agile Methodology Waterfall – Quality Techniques XP- What is Extreme About It? Agile Methods: Twelve Facets of XP Waterfall – Quality Techniques Agile – Quality Techniques Summary 9/17/2018

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 9/17/2018

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 9/17/2018

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 9/17/2018

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 9/17/2018

Questions ?