The Principles Of Systems Analysis And Design

2148 Words Oct 9th, 2016 9 Pages
Task 1) The principles of systems analysis and design

a. Principles of systems analysis

Development Lifecycle Models

Waterfall Model

Feasibility –
Analysis -
Design –
Implementation -
Testing -
Maintenance -

V-shaped model

Rapid Application Development (RAD)

Define the problem
Compare the prototype to the defined Requirements
Make improvements

Spiral Model – is mainly used in larger development projects. The stages are arranged in a spica

Requirements gathering
Risk analysis
Customer evaluation

Tools and techniques
SSADM stands for Structure System Analysis and Design Methodology

Diagram shows on example of SSADM diagram stages.

Stage 0 feasibility -
Stage 1 Investigation of current requirements -
Stage 2 Business System Options -
Stage 3 Definition of requirements -
Stage 4 Technical Systems Options -
Stage 5 Logical Design -
Stage 6 Physical Design –

Data Flow Diagrams (DFD)


Diagram show the actions taking place on business

Symbols used in a DFD

External Entities

Data flows


Data stores

Computer-Aided Software Engineering tools (CASE) and an example such as Microsoft Visio.
Computer-Aided Engineering Tools (CASE)
Using a software to create diagrams such as DFDs
Example –…

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