Introduction to System Analysis and Design

System analysis and design mainly deal with these systems or software development activities.
SAD includes how to shape the organisation, improve performance and achieve objective for profitability and growth. Organisations are complex system that consist of inter-related sub-systems. Changes in one part of system have anticipated and unanticipated consequences in other parts of the system. It provides a framework for visualising the organisational and environmental factors that operate on a  system.

What is System?

System is created to solve problems. The system approach is an organised way of dealing with a problem in the living world. Many of the systems are running like system running in human body which make complete natural system. There are many natural systems like political system, education system and economic system and so on. And one very important system is the information system i.e., the computer system.

The word system is derived from the greek word systema which means organised relationship between components.

System is defined as arrranged in an orderly manner to accomplish an objective. It is not a randomly arranged set. It is arranged with some logic governed by rules, and regulations and policies such an arrangement is also influenced by the objectives. 
For example: the computer system designed to perform commercial purposes then that elements will be data entry devices, CPU, memory, application program and a printer. 
If a computer is designed to complete the objectives of engineer and drawing processes then the elements will be graphic processor, design application software and plotters for output.