Week 8

This is the 8^th week for my study. The days past by so fast. This week we learnt about Information Systems development methodology.

DEFINITION of ISDM

IS Development Methodologies 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.

                                                                                                                                          Jayaratna, (1994)pg. 37

There are many different methodologies used in systems development.

A methodology is a collection of:

•           Procedures

•          Tools

              •           Documentation aids 

These tree elements will help the systems developers to implement 
a new information system.

Why use A Methodology?

-          To make the analysis and design process more accessible to non-expert.

-          To introduce structure into design and make it more manageable.

A part from definitions and the usage of ISD Methodology, I learnt about the types of ISDM as well. There are many types of ISDM such as:

-          Gane and Sarsons (STRADIS)

-          Information Engineering (IE)

-          Jackson System Development

-          Prototyping/ iterative approach

-          Structured approach (SDLC)

-          Soft Systems Methodology (SSM)

-          ETHICS

-          Structured Systems Analysis and Design (SSADM)

After we had study about the types of ISDM, Miss Nisha guided us to know about what are the types of ISDM.

-          STRADIS is based on the building of a logical model of the system, using graphical techniques to enable users, analysts, and designers to get a clear and common picture of the system and how its parts fit together to meet the user's needs.

-          IEM is an architectural approach to planning analyzing, design, and implementing application within an enterprise.

-          JSD is a method of system development that covers the software life cycle either directly or, by providing a framework into which more specialized techniques can fit.

-          Prototyping is an easily modified and extensible model (representation, simulation or demonstration) of a planned software system, likely including its interface and input/output functionality

-          SDLC is defined as the process (as a whole) of developing system or software to meet certain requirements

Summary:

•         Information systems are central to organizational survival.

•         Understand there are a various types of IS Development methodology .

•         A methodology for developing information systems is needed to bring order and structure to a complex technical and organizational process