System Design Essay

1319 words - 6 pages

Requirements Analysis
Chapter 3

3-1

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

Key Definitions
The As-Is system is the current
system and may or may not be
computerized
The To-Be system is the new
system that is based on updated
requirements
The System Proposal is the key
deliverable from the Analysis Phase
3-2

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

Key Ideas

The goal of the analysis phase is to truly
understand the requirements of the ...view middle of the document...

All rights reserved.

What is a Requirement?
1) A statement of what the system must do
2)A statement of characteristics the system
must have
3)Focus is on business user needs during
analysis phase
3 - 10

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

Requirement Types****
Functional Requirements
1)A process the system has to perform
2) Information the system must contain

Nonfunctional Requirements
Behavioral properties the system must have
1)Performance
2)Security
3)Cultural and political

3 - 11

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

Documenting Requirements
Requirements definition report
Text document listing requirements in
outline form
Priorities may be included

Key purpose is to define the project
scope: what is and is not to be
included.
3 - 12

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

Basic Process of Analysis
(Determining Requirements)
1) Understand the “current system
2) Identify improvement opportunities
3) Develop the new system concept
Additional information gathering
techniques are needed as well
3 - 13

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

Business Process Improvement
Goal:
Efficiency
and
effectiveness
for users

3 - 14

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

(How to get user requirements)
******Ways of Fact finder *********

1) Background Reading(Document Sampling)

2) Interviewing
3) Observation
5) Questionnaires

15

1) Background Reading
Document analysis
Aim is to understand the organization
and its business objectives
Includes:
reports
organization charts
policy manuals
job descriptions
documentation of existing systems
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Document Analysis
Study of existing material describing the
current system
Forms, reports, policy manuals,
organization charts describe the formal
system
Look for the informal system in user
additions to forms/report and unused
form/report elements
3 - 17

PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 4th Edition
Copyright 2009 © John Wiley & Sons, Inc. All rights reserved.

.

4- 18

2) Interviewing
Aim is to get an in-depth understanding
of the organization’s objectives, users’
requirements and people’s roles
Includes:
managers to understand objectives
staff to understand roles and information
needs
customers and the public as potential users
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Interviews
Most...

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