1. Introduction on theories of system development

posted May 6, 2015, 3:53 AM by Maurice Nyamoti   [ updated May 11, 2015, 10:10 AM ]
The aim of all these theories and methods is to identify business requirements and to develop information systems that effectively meet them
Some of these theories include:
  1. Traditional approach
  2. Rapid Application Development (RAD)
  3. The structured approach

1. Traditional Approach

It relies mostly on the skills and experience of individual staff members carrying out the project. There are no formal procedures followed and therefore the success of the system is dependent on individual effort. In this approach, the manual system is replaced with a computerised one without change in overall structure of the former system, hence the weaknesses of the former system are not addressed and are carried forward to the new system.

2. Rapid Application Development (RAD)

RAD is also known as prototyping. A prototype is a sample used to test a concept or a process
this is a concept that products can be developed faster and of higher quality through:
  • Gathering requirements using workshops or focus groups
  • Prototyping and early, reiterative user testing of designs
  • The re-use of software components
  • A rigidly paced schedule that defers design improvements to the next product version
  • Less formality in reviews and other team communication

Advantages of the RAD model:

  1.     Reduced development time.
  2.     Increases re-usability of components
  3.     Quick initial reviews occur
  4.     Encourages customer feedback
  5.     Integration from very beginning solves a lot of integration issues.

Disadvantages of RAD model:

  1.     Depends on strong team and individual performances for identifying business requirements.
  2.     Only system that can be modularized can be built using RAD
  3.     Requires highly skilled developers/designers.
  4.     High dependency on modeling skills
  5.     Inapplicable to cheaper projects as cost of modeling and automated code generation is very high.

3. The Structured Approach

Structured approach involves a set of stages that should be followed when developing a system. Each stage is documented in specifying the activities that should be carried out.
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