Computer Application
1 INTRODUCTION TO SYSTEM ANALYSIS AND DESIGN
1.1 INTRODUCTION Systems are created to solve problems. One can think of the systems 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. 1.2 OBJECTIVES After going through this lesson, you should be able to define a system explain the different phases of system development life cycle enumerate the components of system analysis explain the components of system designing 1.3 DEFINING A SYSTEM A collection of components that work together to realize some objectives forms a system. Basically there are three major components in every system, namely input, processing and output.
Input Output
Processing
Fig. 1.1: Basic System Components
2 :: Computer Applications
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 system 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. 1.4 SYSTEM LIFE CYCLE System life cycle is an organizational process of developing and maintaining systems. It helps in establishing a system project plan, because it gives overall list of processes and sub-processes required for developing a system. System development life cycle means combination of various activities. In other words we can say that various activities put together are referred as system development life cycle. In the System Analysis and Design terminology, the system development life cycle also means software development life cycle. Following are the different phases of system
1.1 INTRODUCTION Systems are created to solve problems. One can think of the systems 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. 1.2 OBJECTIVES After going through this lesson, you should be able to define a system explain the different phases of system development life cycle enumerate the components of system analysis explain the components of system designing 1.3 DEFINING A SYSTEM A collection of components that work together to realize some objectives forms a system. Basically there are three major components in every system, namely input, processing and output.
Input Output
Processing
Fig. 1.1: Basic System Components
2 :: Computer Applications
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 system 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. 1.4 SYSTEM LIFE CYCLE System life cycle is an organizational process of developing and maintaining systems. It helps in establishing a system project plan, because it gives overall list of processes and sub-processes required for developing a system. System development life cycle means combination of various activities. In other words we can say that various activities put together are referred as system development life cycle. In the System Analysis and Design terminology, the system development life cycle also means software development life cycle. Following are the different phases of system