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SDLC – Beyond the Waterfall

SDLC – Beyond the Waterfall. Systems Development Life Cycle (SDLC). Many approaches to systems development Sequential versus Iterative Development Understanding the difference between these two approaches is essential Traditional Approach – Waterfall Model.

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SDLC – Beyond the Waterfall

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  1. SDLC – Beyond the Waterfall

  2. Systems Development Life Cycle (SDLC) • Many approaches to systems development • Sequential versus Iterative Development • Understanding the difference between these two approaches is essential • Traditional Approach – Waterfall Model

  3. Systems Development Life Cycle (SDLC) • Traditional Approach is sequential • Waterfall Model is a common example of a sequential approach

  4. SDLC - Waterfall Model Initiation Investigation Analysis Design Implementation Maintenance

  5. SDLC - Waterfall Model • What are the limitations of this approach? • Cannot correct defects from previous stages • No Feedback • Expensive

  6. Example • Existing System – Analysis stage • Extensive problem analysis and Requirements gathered • Move to next stage – Design stage • Create design based on previous analysis stage • What happens if something changes!!

  7. SDLC - Waterfall Model Initiation Investigation Analysis Design Implementation Maintenance

  8. SDLC – Waterfall Model • Limitations of sequential approach has lead to the emergence of a more iterative approach

  9. Traditional vs Agile Traditional Methods • Waterfall Model • Spiral Model • V-Model Agile Methods • Extreme Programming (XP) • Scrum • Adaptive Software Development • Dynamic Systems Development Method (DSDM) • Feature Driven Development

  10. Why Agile? • Instead of the traditional approach

  11. Why Agile? • A more effective method?

  12. A Possible Solution… • Agile software development • Each of these iterations can be seen as miniature software projects

  13. The Agile Software Development Manifesto On February 11-13, 2001 Agile Alliance, (formed of software practitioners and consultants), formed and produced a Manifesto for Agile Software Development Individuals and interactions over processes and tools Working software over comprehensive documentation Customer collaboration over rigid contracts Responding to change over following a plan

  14. People over Process • Human interactions are more important than the company’s processes and tools • Close team relationships • Close working environment

  15. Working Software • Frequent output of working, tested software • Keep It Simple Stupid (KISS)

  16. Relationship With Customer • Reduce the risk of not meeting the terms of contract

  17. Responding to Change • Contracts must be worded so as to allow change

  18. So what makes an agile method? • Incremental • Cooperative

  19. So what makes an agile method? • Straightforward • Adaptive

  20. Agile Methods • Extreme Programming (XP) • Scrum • Adaptive Software Development (ASD) • Crystal Clear and Other Crystal Methodologies • Dynamic Systems Development Method (DSDM) • Feature Driven Development

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