3.2-3 Waterfall Model

Question 1

What is an SDLC Model?

Answer 1

A logical process that describes the major steps analysts perform to develop an info system

Question 2

Waterfall Model Overview

Answer 2

• Traditional approach
• Activities are SEQUENTIAL
• Linear flow from phase to phase
• Clear Milestones & sign-offs

Question 3

(7) Stages in Waterfall Model

Answer 3

1. Planning
   High-level plan
   Feasibility
2. Requirements Analysis
   Determine needs, and start defining functions/operations of the system
3. Design
   How to meet user needs
4. Development
   Hardware/software specs, database design, procedures to follow
   Purchase or develop parts
5. Testing
   For errors/bugs
   Does the system meet needs?
6. Implementation
7. Maintenance

Question 4

Advantages of Waterfall

Answer 4

• Control
• Formalized & consistent
• Helps create estimates for new similar projects

*Works Best: large, clearly defined developments where management can monitor process in a phase-by-phase approach

Question 5

Disadvantage of Waterfall

Answer 5

• Rigid
• Long periods to gather information - the system may be delivered by spec, but the spec is outdated
• Change is hard to implement once started - escalating costs