System Development Approach

The systems approach is a methodology. The methodology is a recommended way of doing things. The systems approach is the basic methodology in solving all kinds of problems. System development life cycle (Systems Development Life Cycle-SDLC) is the application of a systems approach to the development of an information system. Some systems development approach are:
  • Traditional SDLC
  • Prototyping
  • Rapid Application Development
  • Business Process Redesign

Prototyping or manufacture of the prototype include the development of rapid testing systems to be evaluated by end users. The prototype is a version or part of the information system that has been able to work but are only intended as an initial model. The idea is to create a prototype as soon as possible and then get feedback from users that will enable the prototype was refined and improved return very quickly to very suited to the needs of its users.
Prototyping is the process of making the initial draft, try it, fix it, soften it and try again called iterative system development process (iterative) for measures to make it be repeated several times.
Types of Prototype

There are two kinds of prototypes are evolutionary and requirements.
The first is evolutionary prototyping continuously refined until the entire functionality required to have met users of the new system. Step-by-step evolutionary prototype:
  1. Identifying the needs of the user.
  2. Creating a prototype.
  3. Specifies whether the prototype is acceptable
  4. Using the prototype 
The second is the prototype requirements is a prototype that was developed as a way to define functional requirements or demands of the new system when the user is not able to describe clearly what they want on the new system. Steps prototype requirements:
  1. Identifying the needs of the user.
  2. Creating a prototype.
  3. Specifies whether the prototype is acceptable
  4. Creating a program for the new system;
  5. Testing a new system;
  6. Specifies whether the new system can be accepted
  7. Using the new system
Rapid Application Development (RAD)

RAD / Rapid Application Development or Rapid Application Development developed by James Martin (MacMillan, 1991). RAD refers to the systems development life cycle to produce a system quickly without compromising quality.

Information engineering (IE) or engineering information throughout the term of Martin's approach to the development of systems for comprehensive coverage on all activities of the company. below illustrates the life cycle RAD according to Martin that shows how many attempts were issued, both users and information specialists.

RAD requires four essential elements to support the successful development of information systems.
Four elements are:

1. The management, especially top management is expected to be experimenters (experimenter) who do things in new ways or to quickly learn how to use a new methodology
2. People, a special team to carry out all activities quickly SDLC consisting of experts and practitioners who are capable of using the methodology and appropriate tools for success tersiptanya quality system.
3. Methodology, the basic methodology for RAD or RAD life cycle: planning needs, users design, construction, and handover or transition.
4. Aid The tools used in the development process with RAD, such as fourth-generation language, or CASE tool that facilitates prototyping and creation of program code.

Business Process Reengineering (BPR)

We already know that the computer-based information systems can enhance the competitive advantage for the company. So many companies today are focused on making the new information system that will improve their business processes. Some of these projects represents a radical restructuring of the business processes, while other lang make changes gradually.
Process of system development with a redesign or reengineering Business process re-called by reengineeing. BPR affect the operation and utilization of information technology (IT) companies in two ways, namely,

IT can implement BPR to redesign the information system life can not be maintained longer with regular maintenance but the system is still is still valuable. This system is commonly referred to legacy systems (legacy systems).
Companies implementing BPR in its main operations, this business will always give a wave effect that led to the redesign of information systems do.
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