The document discusses the software development life cycle (SDLC) which includes requirements gathering, design, development, testing, and implementation stages. It also describes common SDLC models like waterfall, iterative, and agile. The waterfall model is easy to understand but inflexible, while iterative models allow for risk-driven iterations and evaluation. Agile development enables small scope changes and fast iterations with regular feedback but can be difficult to plan.

1. Software Development Life Cycle
(SDLC)

2. SDLC
What happens at each stage of
the development project
Requirements Gathering
Design
Development
Testing
Implementation
Maintenance

4. SDLC Models
Can help with basic planning,
estimating & scheduling
Can help with project tracking
Can provide visibility to
stakeholders
If used correctly...

5. Common
Models
Waterfall
Iterative
‘Agile’

6. Waterfall
+ Easy to understand and use
+ Clear milestones
+ Consistent requirements
+ Delivers high quality
- Requirements must be specified upfront
- Inflexible to change
- Doesn’t match problem solving

7. Iterative
+ Risk driven iteration, frequent evaluation
+ Clear focus per iteration
+ Early indication of problems
+ Progressive improvement
+ Clear delivery and display of progress
- Lots of time spent evaluating
- Planning and objectives burden

8. Agile
+ Small scope changes
+ Fast iterations
+ Regular feedback
+ Less time spent planning
- Difficult to judge time/progress
- Design & documentation second class
- Rapidly changing requirements