Entry Three : Information System & System Methodology

Hello,

We have learned about information system (IS) and system methodology as our third learning outcome for introduction to information technology course. I would like to reflect back on IS and system methodology  as I understood in my classes. Firstly, IS is a set of components which deal with input, processing and output. IS is also called CBIS ( Computer based information system). It has six components which are people, hardware, software , database, telecommunication and procedures. The functions of IS are to support business operation and to support management.

There are many types of information system. However , we have learnt the four information system which are the basic  information system that we have to know for an organization. They are TPS (Transaction processing system), MIS ( Management information system) , DSS ( Decision support system) and ESS or ES ( Executive support system).

 

In an organization , TPS is the backbone system of the organization. In TPS, business events and transactions are the inputs for the system and the outputs are receipt and report of the activities. TPS is used by operational managers and supervisor.

 

 After TPS system, MIS system is used by  the middle managers in order to produce  report by planning and organizating the information that captured by the TPS system.

                                                

DSS is used by tactical manager to provide solutions and make decisions. The inputs for this system are internal and external information of an organization. For output, graph and texts report are produced.

Moreover , we have learnt  about  ESS system. It is a special type of information system which is a combination of DSS and MIS. It is designed to support higher level of decisions making in an organization.

        

System methodology is a process of designing , testing, and implementing a new application or program. There are six participates in system methodology. They are project manager , programmer, stakeholders, system analyst, support personal and users.

Example of system methodology

We have learned three basic type of system methodology. They are SDLC (system development life cycle ), prototyping and STRADIS.

SDLC is also called structured approached or waterfall model. It is comprehensive method. It can be used for any kind of information system. SDLC has five stages which are system investigation, system analysis, system design, system implementation and system maintenance and review.  

  

Another type of methodology is prototyping. It is suitable for online system. It has four steps which are determine requriments, develop prototype, review prototype with user, and implement and use system.

 

 The final type of system methodology that we have learnt is  STRAIS. It also has four stages  which are detail study, designing alternatives, physical design, and implement system. This methodology is similar with waterfall models or SDLC.