systems

Information systems

A system which acquire records of data ,software and hardware networks that organization collect ,process and distribute. Information system emphasize functionality over management and decision making has 5 constitutes
1. Data
2. Software
3. Hardware
4. Procedures
5. People


System


  • It is a collection of interrelated components that interact to complete a task.
  • System originates from a Latin word systÄ“ma relates to an entire structure made of several parts.
  • System means ''something to look at'' .
  • System can be classified as open and close system.
  • System can also be classified into natural and artificial.
  • Open system is a system that interact freely with the environment.
  • Eg:-Digestive system,Air conditioning system
  • Closed system is a system that do not directly engage with the external environment but exchange energy.
  • Natural system can be separated as living and physical system.
  • Living systems are open self organizing living things that interact with their environment.
  • Physical system is the system which allow physical analysis.


Features of a system

1. Shows interconnectivity with its components.
2. Shows a structure.
3. Shows a proper propriety.Its propriety is relative to the external surrounding.

Information systems can be divided mainly into several forms 

1. Executive systems

2. Management information systems

3. Decision support system

4. Knowledge management system

5. Transaction processing system

6. Office automation systems


Executive system 


Executive systems are used for the fecund summarization of data.

These fecund summarized data  are used to make reports .

These reports are forward to the management level of the company . 

These reports are reviewed by the managers and they will provide sufficient updates to the system. 



Management information system

It normally deals with the interior source of information in a system.

It sets up simple sets of reports for management purposes these are sometimes called as Management reports.

The management reports  are used by senior officers and middle managing level employees.

This play an important role in the entire internal control process . 

Example- Managing the limits of production of goods and services.
                  Finding true  information in new test strategies in a company.



Decision support system

Decision support systems are designed to help management level supervisors to make decisions in dynamic situations . Management reports are used in this key process.

Knowledge management system

Its function is to identify the activities on different systems in regards to  creation,production,distribution and the applications of their products.


there are other types of systems

Transaction processing system

These systems are composed to be used in making process routines efficiently and accurately

Transaction is a operational unit that is used by this system to in order to  process efficiently.
every transaction must succeed or fail as a complete unit . A transaction never stay in a intermediate state .

This system has specific  action called ACID which allows its function properly.

ACID - Atomicity ,Consistency ,Isolation, Durability

Atomicity - it is a state where the transaction is checked if  it is completed or not

Consistency - in this state it checks if transaction is accurate .

Isolation -  this state allows only a single transaction to be processed it never allow simultaneous transactions to take place 

Durability -  after a transaction is completed in here it do not allow the transaction to be subjected to break down .

there are some key features of a transaction processing system 

  1. Reliability
  2. Instant response
  3. Permanent
  4. Control access 




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