Friday, February 20, 2009

The basic concept of system

The basic concept of system

There are two approach to define system that emphasized with procedure and component.

• System is a working network from several procedures that operate together to archive a common purpose.
• System can defined as a collection of components that can interact to reach the objective.

Characteristics of system
•Components of system
The component of system is consist of a number of subsystem. One of system can have a big system that mention supra system.

• Bounds of System
Bounds of System defines difference between the environment and the system.

• Environment
The environment represents everything that is important to understand the function of the system, but is not part of the system. The environment can be ignored in the analysis except for its interaction with the system.
It includes: competition, people, technology, capital, raw materials, data, regulation and opportunities.

• Interface
Interface is the media which connect one of sub system with other sub system.
• Input
Input means all of resources that entered into the system
• Output
Output is result of input had been processed.
• Process
Process means change input to be output
• Goal and objective
Goal and objective means what for the system have been created and whose for the system have been created.

The Classification of system
First definition
In this definitions, system classified as abstract system and physical system.
Second definition
In this definitions, system classified as natural system and human made system.
Third Definition
In this definitions, system classified as deterministic system and probabilistic system.
Fourth definition
In this definitions, system classified as closed system and open system.

Basic concept of information
Before we explain the definition of information, I want you to know the meaning of data. Data are stream of raw fact representing event occur in organizations or the physical environment before they have been organized and arranged into a form that people can understand and use.
And information is data that have been put into a meaningful and useful context and communicated to a recipient who uses it to make decisions. An element of data may constitute information in a specific context.
for example, when you want to contact your friend, his or her telephone number is a piece of information. otherwise, it is just one element of data in the telephone directory.

The Quality of Information
Accurate
Accuracy is measured by comparing the data to actual events. The importance of accurate data varies with the type of decisions that need to be made. Payroll information must be exact. Approximations simply will not suffice. However, a general estimate of how much staff time was devoted to a particular activity may be all that is needed.
Timeliness
Timeliness refers to the currency of the information presented to the users. Currency of data or information is the time gap between the occurrence of an event in the field until its presented to the user (decision maker). When this amount of time is very short, we describe the information system as a real-time system.
Relevance
It means the information have meaningful and useful.
Information is relevant if it leads to improved decision making. It might also be relevant if it reaffirms a previous decision. If it does not have anything to do with your problem, it is irrelevant.

Value of Information
Information does not have an absolute universal value, but we can say the information have a value if the use of information more effective than the cost to have it.

Information System
After we describe the definition of system and information, then we can define the definition of information system.
An information system can defined technically as a set interrelated components that collect, process, store and distribute information to support decision making and control in an organization.
hii...everyone..

this is my first time writing here...

i admit: i can't speak English well...

but.. i must do it...


so...

please correct me...


^o^ happy learning....