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ICOS 3

G.C. EHEDURU

INTRODUCTION TO COMPUTER SERIES
(ICOS)

3: FUNDAMENTALS OF SYSTEMS ANALYSIS AND DESIGN

GERALD C. EHEDURU, Ph.D, MCOAN, KSP
Professor in the Department of

Information Management Technology

FEDERAL UNIVERSITY OF TECHNOLOGY OWERRI, IMO STATE NIGERIA

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G.C. EHEDURU

© Dr. G. C. Eheduru, 1995 - 2002 First Published April, 1995 Reprinted with minor changes, August, 1997 Second Edition May, 2002 All rights reserved. Apart from the purpose of private study, research, criticism or review, no portion of this book may be reproduced in any form or process without permission in writing from the copyright owner. I S B N 978-32782-1-5 Typeset and Produced by AMIDEI COMPUTERS 20 Holy Rosary Road (Irowa Obazee St,), Ugbowo, Benin City, Nigeria Cover Design: An artist's impression of the LAMP in the film 7TH VOYAGE OF SINBAD and which features in the song, "From the Land Beyond, Beyond ...", drawn by Master Chigozie Eheduru from a moulded model of the same lamp which he sculptured and presented to his school, U D S S, Benin City, in 1995. ... If anything, a systems analyst certainly needs a lamp!

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G.C. EHEDURU

DEDICATED

By the Glory of God And For an Everlasting Memorial To

Dr Benjamin Ogu Anyanwu
- Philosopher, Diplomat, Medical Consultant, Community Leader, A Foremost Systems Analyst, A Legend of Our Times and Best of them All My Uncle

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G.C. EHEDURU

CONTENTS
Page

Dedication ......................................... iii Contents Preface ......................................... iv ......................................... vii

CHAPTER 1

INTRODUCTION
1.1 1.2 Meanings, Definitions of Terms ................ 1 The Systems Analyst............................ 3 1. Functions and Duties ...........................3 2. Attributes of a Systems Analyst.................4 1.3 1.4 1.5

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Objectives of Systems Analysis and Design........5 Major Steps in Systems Analysis and Design.......6 Tools and Techniques in Aid of Systems Analysis and Design..............................7 Review Questions ................................8

CHAPTER 2

PROJECT PLANNING AND SELECTION
2.1

10

Sources for Ideas for Selecting Systems Projects ….11

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ICOS 3

G.C. EHEDURU

2.2 2.3

Criteria for Selecting System Projects..........13 Project Planning................................15 Review Questions............................ 21

CHAPTER 3

FEASIBILITY STUDY
3.1 3.2 3.3 3.4 3.5 The Assignment Brief............................22

22

Top Management Support and Involvement........24 The Steering Committee for the Project..........25 Feasibility Study (or Survey)...................27 Cost-Benefit Analysis...........................29 Review Questions.....................32

CHAPTER 4

SYSTEMS ANALYSIS AND INVESTIGATION 34
4.1 4.2 4.3 4.4 4.5 Fact Finding Techniques.........................34 Inspection of Records...........................39 Data (or Fact) Documentation....................41 Cost-Benefit Analysis...........................42 Systems Investigation Report....................42

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ICOS 3

G.C. EHEDURU

Review Questions................................43 CHAPTER 5

SYSTEMS SPECIFICATION
5.1 5.2 5.3 5.4 Objectives of Systems Specification.............46 Definition of Systems Objectives................46 Specification of Output Data Elements...........50 System Definition Document......................53 Review Questions................................54

45

CHAPTER 6

SYSTEMS DESIGN
6.1 6.2 6.3 6.4 Objectives and Main Activities of Systems Design...................58

57

Order of Approach to a Systems Design...........60 Decision Tables.................................66 Flowcharts......................................70 Review Questions................................79

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G.C. EHEDURU

CHAPTER 7

SYSTEMS IMPLEMENTATION
7.1 7.2 7.3 7.4 7.5 Purchase or Acquisition...
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