Topic 3: Information Systems

The topics were little bit tough for me to get through even though I managed to study with my friend and I got to know a good knowledge about this particular topic. The reflected lesson topics will show the gained knowledge about the above topic.

This is one of main topic which I studied under Information Technology. I learnt so many useful things under this topics. The main thing I learnt is about Information Systems. Information system means a set elements of components. Basic system model are input, process, output. Here input is customer, process is stock holder, and output is supplier. This is all about an organisation’s system model.

There are lots of Information Systems. That are, 

Executive Support System (ESS)--used by top executives

Transaction Processing System (TPS)--used by low-level operational managers

Decision Support System (DSS)--used by middle level managers usually to support unstructured problems

Management Information System (MIS)--also used by maiddle-level managers to support structured problems.

Expert System (ES)

Office Automated System(OAS)

FOR A CBIS to carry out its functions 6 components must be present as shown below

                                                IS DEVELOPMENT

For the IS to be used it has to be developed and there are different ways in which an information system can be developed. The more common IS Methodologies  are:

-Gane & Sarsons (STRADIS)-which is the earliest and widely used methodology

-Information Enginnering (IE)

-Structured Approach (SDLC)

-Prototyping/ iterative approach

-Jackson System Development

-Ethics

-Soft System Methodology (SSM)