SDLC

System development life cycle

There are two types of SDLC the 4 stage and the 6 stage

Note that in the six stage SDLC some of the steps fit into the four stage

4 stage

1.Plan

2.Design

3.Development

4.Implement

6 stage

1.Prelimenary investigation

1.Analysis

Design

Development

4.Implementation

4.Maintainance

A system has an SDLC which uses different methodologies such as waterfall, rad, prototype or o-o, it is made in three phases

Phase one – The initial investagation

• Feasibility study
• Estimate
• Roles/ organisation chart
• Scope
• Recommendations

Phase two – Requirement modelling

• Data flow diagram (DFD)
• o-o Modelling (using the case diagram)

Phase three – Design

• System design specification