System Analysis and Design - Overview
System Analysis and Design - Overview
System Analysis and Design - Overview
Systems development is systematic process which includes phases such as planning, analysis,
design, deployment, and maintenance. Here, in this tutorial, we will primarily focus on −
Systems analysis
Systems design
Systems Analysis
It is a process of collecting and interpreting facts, identifying the problems, and decomposition of a
system into its components.
System analysis is conducted for the purpose of studying a system or its parts in order to identify
its objectives. It is a problem solving technique that improves the system and ensures that all the
components of the system work efficiently to accomplish their purpose.
Systems Design
It is a process of planning a new business system or replacing an existing system by defining its
components or modules to satisfy the specific requirements. Before planning, you need to
understand the old system thoroughly and determine how computers can best be used in order to
operate efficiently.
Systems
Processes
Technology
What is a System?
The word System is derived from Greek word Systema, which means an organized relationship
between any set of components to achieve some common cause or objective.
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Constraints of a System
A system must have three basic constraints −
A system must have some structure and behavior which is designed to achieve a predefined
objective.
For example, traffic management system, payroll system, automatic library system, human
resources information system.
Properties of a System
A system has the following properties −
Organization
Organization implies structure and order. It is the arrangement of components that helps to achieve
predetermined objectives.
Interaction
It is defined by the manner in which the components operate with each other.
For example, in an organization, purchasing department must interact with production department
and payroll with personnel department.
Interdependence
Interdependence means how the components of a system depend on one another. For proper
functioning, the components are coordinated and linked together according to a specified plan. The
output of one subsystem is the required by other subsystem as input.
Integration
Integration is concerned with how a system components are connected together. It means that the
parts of the system work together within the system even if each part performs a unique function.
Central Objective
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The objective of system must be central. It may be real or stated. It is not uncommon for an
organization to state an objective and operate to achieve another.
The users must know the main objective of a computer application early in the analysis for a
successful design and conversion.
Elements of a System
The following diagram shows the elements of a system −
Inputs are the information that enters into the system for processing.
Output is the outcome of processing.
Processor(s)
The processor is the element of a system that involves the actual transformation of input into
output.
It is the operational component of a system. Processors may modify the input either totally or
partially, depending on the output specification.
As the output specifications change, so does the processing. In some cases, input is also
modified to enable the processor for handling the transformation.
Control
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It is the decision–making subsystem that controls the pattern of activities governing input,
processing, and output.
The behavior of a computer System is controlled by the Operating System and software. In
order to keep system in balance, what and how much input is needed is determined by Output
Specifications.
Feedback
Feedback provides the control in a dynamic system.
Positive feedback is routine in nature that encourages the performance of the system.
Negative feedback is informational in nature that provides the controller with information for
action.
Environment
The environment is the “supersystem” within which an organization operates.
It determines how a system must function. For example, vendors and competitors of
organization’s environment, may provide constraints that affect the actual performance of the
business.
Each system has boundaries that determine its sphere of influence and control.
The knowledge of the boundaries of a given system is crucial in determining the nature of its
interface with other systems for successful design.
Types of Systems
The systems can be divided into the following types −
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Physical System may be static or dynamic in nature. For example, desks and chairs are the
physical parts of computer center which are static. A programmed computer is a dynamic
system in which programs, data, and applications can change according to the user's needs.
Abstract systems are non-physical entities or conceptual that may be formulas, representation
or model of a real system.
A closed system does not interact with its environment. It is isolated from environmental
influences. A completely closed system is rare in reality.
Non Adaptive System is the system which does not respond to the environment. For example,
machines.
Temporary System is made for specified time and after that they are demolished. For example,
A DJ system is set up for a program and it is dissembled after the program.
Manufactured System is the man-made system. For example, Rockets, dams, trains.
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Probabilistic System shows uncertain behavior. The exact output is not known. For example,
Weather forecasting, mail delivery.
In Human-Machine System, both human and machines are involved to perform a particular
task. For example, Computer programming.
Machine System is where human interference is neglected. All the tasks are performed by the
machine. For example, an autonomous robot.
This system includes hardware, software, communication, data, and application for producing
information according to the need of an organization.
Informal Information System − This is employee based system which solves the day to day
work related problems.
Computer Based System − This system is directly dependent on the computer for managing
business applications. For example, automatic library system, railway reservation system,
banking system, etc.
Systems Models
Schematic Models
A schematic model is a 2-D chart that shows system elements and their linkages.
Different arrows are used to show information flow, material flow, and information feedback.
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Program Evaluation and Review Technique (PERT), for example, is used to abstract a real
world system in model form.
The Gantt chart, for example, gives a static picture of an activity-time relationship.
Categories of Information
There are three categories of information related to managerial levels and the decision managers
make.
Strategic Information
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This information is required by topmost management for long range planning policies for next
few years. For example, trends in revenues, financial investment, and human resources, and
population growth.
This type of information is achieved with the aid of Decision Support System (DSS).
Managerial Information
This type of Information is required by middle management for short and intermediate range
planning which is in terms of months. For example, sales analysis, cash flow projection, and
annual financial statements.
Operational information
This type of information is required by low management for daily and short term planning to
enforce day-to-day operational activities. For example, keeping employee attendance records,
overdue purchase orders, and current stocks available.
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