System Analysis and Design

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  • Topic: System, Systems theory, Decision support system
  • Pages : 119 (29565 words )
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  • Published : January 23, 2013
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Lesson No: 1|Lesson Name : Overview of System Analysis & Design| Author : Dr. Jawahar|Vetter:|Prof. Dharminder Kumar|

1.0 Objectives:

1.1 Introduction

1.2 Over View of System Analysis and Design

1.3 Business System Concepts

1.4 Characteristics of a System

1.5 Elements of a System

1.6 Types of Systems

1.7 Systems Models

1.8 Categories of Information

1.9 Summary

1.10 Questions

1.0 Objectives

Defining a system

The role of computer in information systems

What are the characteristic and element of information system

What are the various types of information system and models

What are the different types of specialised information system

1.1 Introduction

In business, System Analysis and Design refers to the process of examining a business situation with the intent of improving it through better procedures and methods. System analysis and design relates to shaping organizations, improving performance and achieving objectives for profitability and growth. The emphasis is on systems in action, the relationships among subsystems and their contribution to meeting a common goal.

Looking at a system and determining how adequately it functions, the changes to be made and the quality of the output are parts of system analysis. Organizations are complex systems that consist of interrelated and interlocking subsystems. Changes in one part of the system have both anticipated and unanticipated consequences in other parts of the system. The systems approval is a way of thinking about the analysis and design of computer based applications. It provides a framework for visualizing the organizational and environmental factors that operate on a system. When a computer is introduced into an organization, various functions’ and dysfunction’s operate on the user as well as on the organization. Among the positive consequences are improved performance and a feeling of achievement with quality information. Among the unanticipated consequences might be a possible threat to employees job, a decreased morale of personnel due to back of involvement and a feeling of intimidation by users due to computer illiteracy. The analyst’s role is to remove such fears and make the system a success. System analysis and design focus on systems, processes and technology.

1.2 Over View of System Analysis and Design

Systems development can generally be thought of as having two major components: Systems analysis and Systems design. System design is the process of planning a new business system or one to replace or complement an existing system. But before this planning can be done, we must thoroughly understand the old system and determine how computers can best be used to make its operation more effective. System analysis, then, is the process of gathering and interpreting facts, diagnosing problems, and using the information to recommend improvements to the system. This is the job of the systems analyst.

Consider, for example, the stockroom operation of a clothing store. To better control its inventory and gain access to more up – to – date information about stock levels and reordering, the store asks a system analyst, to “computerize” its stockroom operations. Before one can design a system to capture data, update files, and produce reports, one needs to know more about the store operations: what forms are being used to store information manually, such as requisitions, purchase orders, and invoices and what reports are being produced and how they are being used.

To proceed, you then seek out information about lists of reorder notices, outstanding purchase orders, records of stock on hand, and other reports. You also need to find out where this information originates, whether in the purchasing department, stockroom, or accounting department. In other words, you must understand how the existing system works and, more specifically, what the flow...
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