1. Systems Development Life Cycle
Software Development
Systems Development Life Cycle

2. What is the SDLC? Used by every software developer in some form
Encompasses different development styles
Is client-focused
Based on ‘getting it right’

3. Who is Involved?
Best case – The client, an analyst, a project manager, a designer, a developer
Industry – The client, a manager, developers (& possibly a designer)

4. Stages of the SDLC Investigate Design Develop / Test Implement Support
Evaluate
START AGAIN!

5. Methods of Development: The Waterfall Method
Used mostly in academic projects
Steps through each process in the SDLC in turn
What are the drawbacks?
Problem Definition
Feasibility & Analysis
Design
Implementation (Build)
Testing & Maintenance

6. Methods of Development: The Spiral Method
Used in industry for project with ‘unknowns’
Any stage may be revisited at any time to alter the client’s requirements
What are the drawbacks?
Problem Definition
Feasibility
Analysis
Design
Implementation
Testing
Maintenance

7. Methods of Development: Agile Development (or RAD)
Used in most industry projects
Creates alliance between client and developer
Focused on delivering in bug free ‘modules’
Why is this used in industry?
Problem Definition (module)
Feasibility of module
Analysis of module
Design with Client
Build
Client Testing
Implementation

8. What constraints could be placed on a computing project?
What is Feasibility?
Every computing project should have a feasibility study included.
This is an initial analysis to determine whether the project is feasible within the constraints placed upon it.
What constraints could be placed on a computing project?

9. Feasibility
Technical
Operational
Economic
Schedule / Social

10. What is involved in Feasibility?
Can you actually build this?
What are the constraints of your project (TOES!)
Can your client implement & use this?
Can your client afford this? (if not, you don’t get paid!)
Can you complete this (and your report) by the deadline? In here, plan out your work using a timetable or Gantt Chart

11. Can I read my client’s mind??
Investigations
If the project is feasible, first get your facts right!
Fact finding:
Questionnaires
Observation
Data Gathering
Interviews
Can I read my client’s mind??

12. System Requirements User interface requirements
Processing requirements
Storage requirements
Control Requirements