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Introduction

In this section we compare the strengths and weaknesses of current systems development methodologies.

A methodology is a collection of:

  • Procedures
  • Tools
  • Documentation aids

So what is Structured Design? This simply means that the design process follows a path through several stages, which can be incremental or sequential in nature.

In the last 30 years a number of methodologies, incorporating a variety of techniques, have been developed to make the analysis and design stages more manageable. Almost every methodology has at its heart at least one modelling technique. There are several of these methodologies in existence, but perhaps the best known is the one called SSADM - Structured Systems Analysis and Design Methodology, developed in the early 1980s. Some of the others include:

  • IE (Information Engineering)
  • SSADM (Structured Systems Analysis and Design Methodology)
  • JSD (Jackson Systems Development)
  • SSM (Soft Systems Methodology).

They all more or less follow the same process:

  • Document the current system
  • Specify the requirements of the required system
  • Create the required system.

SAQ1

Look on the Internet and see if you can find any other 'structured' methodologies.

There is no fixed solution to this activity. If possible, discuss your answers with other students and your tutor.

Next: What is SSADM?