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 -

http://coldstar14.blogspot.co.uk/2013/01/project-planning-illustrate-typical.html

V-shaped model

Rapid Application Development (RAD)

Define the problem
Build a PROTOTYPE
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
Prototyping
Costing
Testing
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)

Description

Diagram show the actions taking place on business

Symbols used in a DFD

External Entities

Data flows

Processes

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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