INFORMATION SYSTEM DEVELOPMENT METHODHOLOGIES
IS Development Methodology...
A IS development methodology or system development
methodology in software engineering is a framework that is used to structure,
plan, and control the process of developing an information system. A
methodology is a collection of Procedures, Tools, and Documentation-Aids which
will help the systems developers to implement a new information system.
Types ofIS Development Methodhologies...
- SDLC (System Development Life Cycle)
- PROTOTYPING
- JSD - JACKSON SYSTEM DEVELOPMENT
- INFORMATION ENGINEERING (IE)
- GANE and SARSONS (STRADIS- STRUCTURED ANALYSIS, DESIGN AND IMPLEMENTATION OF INFORMATION SYSTEMS)
SDLC (System Development Life Cycle)...
- The systems
development life cycle (SDLC) is a conceptual model used in project management
that describes the stages involved in an information system development
project, from an initial feasibility study through maintenance of the completed
application.
- Various SDLC
methodologies have been developed to guide the processes involved, including
the waterfall model (which was the original SDLC method); rapid application
development (RAD); joint application development (JAD); the fountain model; the
spiral model; build and fix; and synchronize-and-stabilize.
PROTOTYPING...
- Prototyping is
about people. Users are not often able to articulate what they want an
information system to do, and they cannot visualize it from written
specifications.
- Prototyping
enables them to see a system, "play" with it and modify it before it
is implemented.
- The Prototyping
Methodology" to give Information Systems persons, and through them user
persons, a methodology for them to learn what the current "system"
is, design a new system as a prototype, refine it and implement it.
STRADIS (STRUCTURED ANALYSIS, DESIGN AND IMPLEMENTATION OF INFORMATION SYSTEMS)...
- This was developed by Chris Gane and
Trish Sarson in 1979 and is based on structured process modeling where complex
problems are broken down in a detailed and formal way.
- The methodology is best suited to an
environment where due to the lack of resources or the excessive demand for
system development, there is a need for prioritization.
JSD - JACKSON SYSTEM DEVELOPMENT...
- Michael Jackson and John Cameron
developed this in the 1970’s.
- Although it is based on the structured approach to system development the emphasis of the methodology is to produce software systems.
- Although it is based on the structured approach to system development the emphasis of the methodology is to produce software systems.
- It is suitable for the
development of real-time systems where processes are more significant than
data.
- JSD does not address any of the organizational needs and is not comprehensive in addressing all aspects of the system life cycle.
- There are six steps in this methodology, and these are categorized into three major phases:
- JSD does not address any of the organizational needs and is not comprehensive in addressing all aspects of the system life cycle.
- There are six steps in this methodology, and these are categorized into three major phases:
- Modeling Phase
- Network Phase
- Implementation Phase
INFORMATION ENGINEERING -IE...
- Clive Frankenstein in Australia and Ian
Palmer in London established the origin of Information Engineering separately
in the 1970’s. This methodology advocates:
- The development of a corporate data model
that defines the structure and nature of an organization’s data and that cans
support a whole range of business systems.
- The use of diagrams to communicate all
the necessary information to end users-and management.
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