In this week we were exposed the Information System Development Methodologies which was defined by Jayaratna as a contain models and reflect particular perspectives of ‘reality’ based on a set of philosophical paradigms. A methodology should tell you ‘what’ steps to take and ‘how’ to perform those steps but most importantly the reasons ‘why’ those steps should be taken, in that particular order. Maddison et al, defined as as a recommended collection of philosophies, phases, procedures, rules, techniques, tools, documentation, management and training for developers of information systems.
Why do we need to use a Methodology?
We learned that it makes the analysis and design process more accessible to non-experts. Also, to introduce structure into design and make it more manageable.
After this short brief, we had an activity which we had to search and reflect on the various methodology definitions.
Later on, we learned about the types of ISD methodologies:
Structured approach (SDLC): is the oldest and most known methodology used to coordinate the efforts of information systems development is known as the "Waterfall". It covers many activities starts from understanding why the system should be built, studying the project feasibility, analyzing problems, choosing the system design and architecture, implementing and testing it, up to delivering the system as product to the user.
Jackson System Development (JSD): method of system development that covers the software life cycle either directly or, by providing a framework into which more specialized techniques can fit.
information engineering (IE): is an approach to designing and developing information systems.
Prototyping: An easily modified and extensible model (representation, simulation or demonstration) of a planned software system, likely including its interface and input/output functionality.
Gane and Sarsons (STRADIS): The methodology remains today as one of the most popular techniques for structured analysis and design of systems.
Session 2,
In this session, we were given a case study to work on. We needed to develop the system for AIU. Therefore, me and my group members, we chose TPS and EIS as a Information System, and SDLC as a methodology.
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