Basic Concept of Information Systems Analysis and Design

There are two approaching to definition of system:

1. Definition of system based on approach of procedure
According to this approach, system interpreted by as a working network from procedures which is interaction and work along to finish a specific-purpose or goal. A procedure is a correct sequences of instruction steps explaining what have to be done, who have to do, when have to be done and how to do that.

2. Definition of system based on approach of element

According to this approach the definition of system is a set of elements which is have interaction to reach specific-purpose or goal.

Characteristic system

Characteristic a system can be explained as follows:

1. Components
Consist of a number of components which interact, what each other working along to form an unity. The example is Supra System that is a larger ones system.

2. Boundary
A system has a boundary to limiting system with environmental or other system outside its.

3. Environments
Environment is a media link between a subsystem with other subsystem.

4.Interfaces
Interfaces represent link media between one subsystem with other subsystem. Passing this link enable the source of resource emit a stream of from one sub system to other sub system.

5. Input
Entered energy into system can in the form of treatment input and signal input. The treatment input is entered energy system to can walk. While signal input is energy which in process to yield output.

6. Output
The result from processed energy and classified is become an output which good for and rest of dismissal.

7. Process
Process is the change an input become output.

8. Objective/goal
A system sure have field goal or objectives. If system don't have target hence system operation there will be no use.

The Classification Of System

a. Physical system
System abstract is which in the form of idea or idea which not see itsly it system teologia.

b. Abstract system
System physical represent existing system physically, for example computer system.

c. Deterministic System

The Certain system operate with behaviour which have earned can be predicted, interaction between its sharess can be detected categorically so that its output can be forecasted. for example : Computer programe, executing precisely as according to its instruction network. System of pay, and others.

d. Probabilistic System
The System which is input and its process can be defined, but yielded output cannot be determined categorically; always there is a little mistake / deviation to forecast of the way system. for Example : marketing system.

e. Open System
The system that relation and effect external environment .This system accept input and yield output for external environment / the other sub system, so that have good operation system. This system tend to measure up to adaptation, can adapt to its environment so that can continue its.

f. Closed System
The System Physical where the process that happened do not experience of transfer of items, information or energy with environment outside system. This system work automatically without existence of interfere in of external side of it.

g. Relatively Closed System
The closed System but doesn't closed at all to accept other influences. This system in its operation can accept influence from outside which have been defined in certain boundarys.

h. Artificial System
The System imitating occurence in system. This system is formed pursuant to occurence in nature where human being unable to do it. Equally imitat exist in nature.

i. Natural System
The natural System is occurence in nature. for Example of : sea, solar system and others.

j. Human made system
Human made system is system which condition of its dicey future because containing probability element.

Information
Data is fact. Information is data that processed become better form and more meaning to accept it. If data is not useful to accept it so the data cannot be referred as by information.

Information Cycle
Data represent form which still raw which not yet earned to tell a story many, so that need processing is furthermore. Data processed to pass a model to yielded information. Data processed to yield information use certain process model.
Processed data pass a model become information, receiver later then accept the information, making a decision and conduct action, meaning to yield the other action to make a number of data return. The data will be arrested as input, in process return to pass a model and so on form a cycle.

Quality Of Information
Quality of information depended from three things, that is ;

1.Accurate
Accurate meaning information have to free from mistakes and cannot or mislead. Accurate mean information be clear express its intention.

2.Timeliness
Timeliness meaning incoming information receiver may not lose time.

3.Relevance
Information have benefit for its user.