1. Business Management
Study Manuals
Diploma in
Business Management
SYSTEMS ANALYSIS
AND DESIGN
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3. Diploma in Business Management
SYSTEMS ANALYSIS AND DESIGN
Contents
Unit Title Page
1 Information and Systems 1
Information and Data 3
Information Needs 3
Types of Information 5
Management Information 8
Systems Theory 10
Objectives of a System 12
Information Systems 13
Types of Information System 14
2 The Systems Development Life Cycle 17
The SDLC 18
The Waterfall Model 21
Advantages of the SDLC 22
Disadvantages of the SDLC 23
Conclusion 23
3 System Specification 25
Introduction 27
The Development Life Cycle 27
Statement of Requirements 30
The Personnel Involved 33
Systems Investigation 38
The Feasibility or Initial Study 46
Requirements Specification 51
Using Consultants 51
4 System Design 53
Logical and Physical Design 54
The Design Stage 55
System Design Specification 58
Design Considerations 59
Human-Computer Interface 62
4. Unit Title Page
5 Approaches to Systems Analysis and Design 67
Introduction 69
Hard and Soft Systems 69
The Soft Systems Methodology (SSM) 70
Structured Systems Analysis and Design Method (SSADM) 75
Object-Oriented Analysis and Design (OOAD) 79
Web Informations Systems Development 81
Rapid Application Development (RAD) 82
Joint Application Development (JAD) 83
Skilled Small Team Development 83
Prototyping 84
CASE Tools 85
6 Data Flow Diagrams 87
Introduction 88
An Example System 88
Data Flow Diagrams (DFDs) 89
Levels of Data Flow Diagram 93
Drawing Data Flow Diagrams 95
Physical and Logical DFDs 96
Advantages and Disadvantages of DFDs 98
7 Data Modelling 103
Introduction 104
Entities, Attributes and Relationships 104
Entity Relationships 105
Optional and Mandatory Relationships 108
Many-to-Many Relationships 110
What Happens Next? 111
Data Dictionaries 113
8 Entity Life Histories (ELH) 119
Introduction 120
ELH Notation 120
Interrelationship between the DFD, Entity-Relationship Model and the
ELH 125
Examples 126
9 Object Orientation and the Unified Modelling Language (UML) 131
Introduction 132
Background 132
Objects and Object Classes 133
Class Diagrams 134
Use Cases 144
Sequence Diagrams 146
Conclusion 148
5. Unit Title Page
10 Standards and Documentation 149
Introduction 150
Role and Scope of Standards 150
The Standards Manual 153
Other Documentation 153
Using Standard Forms 156
11 System Implementation 157
The Implementation Process 158
User Involvement 161
Changeover Strategies 161
Post-Implementation Reviews 167
Training 171
12 Management of Change and Project Management 175
Management of Change 176
Project Management 179
Problems During Development 180
Rules of Project Management 182
Specific Development Controls 183
Control Techniques 184
13 System Maintenance and Security 191
Monitoring 192
Systems Maintenance 193
Database Maintenance 194
System Enhancements 195
Need for System Security 196
Security Measures 199