Systems Life Cycle. The main disadvantage of the traditional waterfall method is with the sequence of stages, in that often the system cannot be tested or run until it is fully complete.

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SYSTEMS

ANALYSIS

1. Traditional Systems Life Cycle 4

1.1 Introduction 4

1.2 Shortcomings 5

1.3 Stages 5

1.3.1 Initiation 5

1.3.2 Feasibility 5

1.3.3 Investigation and Analysis 5

1.3.4 Design 5

1.3.5 Implementation 6

1.3.6 Testing 6

1.3.7 Maintenance 6

2. SSADM 6

2.1 Introduction 6

2.2 Advantages / Disadvantages 6

2.3 Suitability 7

2.4 Stages 7

2.4.1 The Feasibility Study 7

2.4.2 Investigation of Current System 8

2.4.3 Business Systems Options (BSOs) 8

2.4.4 Requirements Specification 8

2.4.5 Technical System Options (TSOs) 8

2.4.6 Logical Design 8

2.4.7 Physical Design 8

2.5 Tools and Techniques 8

2.5.1 Data Flow Diagrams (DFD) 8

2.5.2 Entity Relation Diagrams 10

3. DSDM 10

3.1 Introduction 10

3.2 Advantages / Disadvantages 10

3.3 Suitability 10

3.4 Stages 10

3.4.1 Functional Model Iteration 11

3.4.2 Design and Build Iteration 11

3.4.3 Implementation 11

3.5 Tools and Techniques 11

3.5.1 CASE Tools 11

3.5.2 Facilitated Workshops 11

4. Fact-finding 11

4.1 Document analysis 11

4.2