February, 16th 2009 Definition System and Information

System Definition
System is a drove of element that related and influenced to each other within working together to reach an objective. A system can divide by some subsystem, and the subsystem can divide again by smaller another subsystem.
Example:
Accounting system divide by selling accounting subsystem, buying accounting subsystem, salary accounting subsystem, etc, with the documents for the basic of its components, like a journal, finance, etc.

Characteristic of System
A system have a specific characteristic:

1. The components based by the amount of components that interacted, and working together to be a unity. Component can divide by some subsystem, where every that subsystem have a special function and will be influenced whole of the system process.
2. The boundary is the territory that bounded between the system and the outside area or another system. This system can make a system looks like a unity, because with this boundary the function and the order of subsystem with the each other are different but also still can interacted. This boundary referring to a scope from the system.
3. The environments, is whatever at the outside of the boundary that influenced the system operation. The environments can be benefit or can be damage. The benefit environments must keep care, and the damaging environment must be controlled.
4. The interface is a connector media between the subsystems, which can make the sources flow from a subsystem to another subsystem. The output from a subsystem will be an input for another subsystem through the interface and integrating the subsystems to be a unity.
5. Input is the energy which putted into system, it kind maintenance input and signal input. Maintenance input is an energy which putted into a system in order to make the system can operated, and the signal input is an energy that processed to get the new output. For an example in computer system, program is maintenance input that use to operating computer and data is a signal input which processed to be information.
6. Output is the result from the energy which processed to be useful output. The output can form to the input for another subsystem. For example the computer system, the heat resulted is useless output and kind of residue, but the information is necessity output.
7. Process, the system can have a part of process which will change input to be an output. The production system will process the input can kind a material to be an output can kind a new item. For example, the accounting system will process the transaction data to be finance report and another report that needed for management.
8. Objectives or goal, the system must have a goal or objective. If the system doesn’t have a goal, so the operating system will be useless. The objective for a system is very determined to know what the input needed and what the output resulted from a system. The can called success if that system can reach the goal.

Definition of Information

Information is data which processed to be more useful form for whom receiving that information.

Information Quality

• Accurate

The information must free from mistakes and not mislead.

• Real Time

The information that comes to receiver must not too late.

• Relevan

The information must useful for its receiver.

Value of information determined from two things, which are benefit and cost to get that information.

The information will valuable if the benefit bigger than cost to get that information.

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