System Analysis and Design
CHAPTER 1
INTRODUCTION
1. Concepts
System Analysis and Design in this unit (SAD) is the application of the system approach to the study and solution of problem using computer-based systems
Systems approach is a way of thinking about the analysis and design of a computer –based application. It provides a framework of visualizing the organizational and environmental factors that operate on a system.
Organizations are complex systems that consist of interrelated and interlocking sub-systems.
Systems analysis and design focuses on; - Systems - Processes - Technology
What is a system?
The term system is derived from a Greek word Systema meaning an organized relationship among functioning units or components.
OR;
A system is an orderly grouping of interdependent components linked together according to a plan to achieve a specific objective.
A Component may refer to: Physical parts e.g.; engines, wings of air craft, wheels of a car etc; Managerial steps (planning, organizing, directing and controlling);A sub-system in a multi-level structure.
A system exists because it is designed to achieve one or more objectives.
Examples of systems: Transpiration system, Telephone system, Computer system e.t.c
2. Characteristics of a system 1. Organization (order) 2. Interaction 3. Interdependence 4. Integration 5. A central objective
Organization: This implies structure and order. It is the organization of components that help to achieve the objectives. For example: A computer system is designed around as input device, a Central Processing Unit, an Output Device and a Storage Device. When linked together they work as a whole system for producing information. Fig. 1.1
[pic]
Fig. 1.1: Organization Structure
Interactions: Refers to the manner in which each component functions with other components of the system. Example: In computer system, the CPU must interact with Input Device to solve a problem. In turn, the Main Memory holds programs and data that the
INTRODUCTION
1. Concepts
System Analysis and Design in this unit (SAD) is the application of the system approach to the study and solution of problem using computer-based systems
Systems approach is a way of thinking about the analysis and design of a computer –based application. It provides a framework of visualizing the organizational and environmental factors that operate on a system.
Organizations are complex systems that consist of interrelated and interlocking sub-systems.
Systems analysis and design focuses on; - Systems - Processes - Technology
What is a system?
The term system is derived from a Greek word Systema meaning an organized relationship among functioning units or components.
OR;
A system is an orderly grouping of interdependent components linked together according to a plan to achieve a specific objective.
A Component may refer to: Physical parts e.g.; engines, wings of air craft, wheels of a car etc; Managerial steps (planning, organizing, directing and controlling);A sub-system in a multi-level structure.
A system exists because it is designed to achieve one or more objectives.
Examples of systems: Transpiration system, Telephone system, Computer system e.t.c
2. Characteristics of a system 1. Organization (order) 2. Interaction 3. Interdependence 4. Integration 5. A central objective
Organization: This implies structure and order. It is the organization of components that help to achieve the objectives. For example: A computer system is designed around as input device, a Central Processing Unit, an Output Device and a Storage Device. When linked together they work as a whole system for producing information. Fig. 1.1
[pic]
Fig. 1.1: Organization Structure
Interactions: Refers to the manner in which each component functions with other components of the system. Example: In computer system, the CPU must interact with Input Device to solve a problem. In turn, the Main Memory holds programs and data that the
Bibliography: Adapting the procedure presented by Awad (1997), the determination of costs and benefits entails the following steps: i