System analysis and Design

Open or Closed System

Five characteristics of open system can be identified:

1. Input from outside

2.Entropy

3.Process,output, and cycles

4.Differentiation

5.Equifinality


Man-Made Information System

In information system may defined as set of devices,procedures, and operating system designed around user-based criteria to produce information and communicate it to the user for planning control and performance.
the major infomation systems are (1) formal .(2) informal .and (3) computer based.