Introduction to System

INTRODUCTION

Systems are created to solve problems. One can think of the sys-tems approach as an organized way of dealing with a problem. In this dynamic world, the subject System Analysis and Design (SAD), mainly deals with the software development activities.

DEFINING A SYSTEM

A collection of components that work together to realize some objec-tives forms a system. Basically there are three major components in every system, namely input, processing and output.

Input		Processing	Output

Fig. 1.1: Basic System Components

In a system the different components are connected with each other and they are interdependent. For example, human body represents a complete natural system. We are also bound by many national systems such as political system, economic system, educational sys-tem and so forth. The objective of the system demands that some output is produced as a result of processing the suitable inputs. A well-designed system also includes an additional element referred to as ‘control’ that provides a feedback to achieve desired objectives of the system.