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Foundations of
Software
Engineering
Foundations of
Software
Engineering
Ashfaque Ahmed
SCM Consulting, Bhilai, Chattisgarh, India
Bhanu Prasad
Florida A&M University, Tallahassee, USA
CRC Press
Taylor & Francis Group
6000 Broken Sound Parkway NW, Suite 300
Boca Raton, FL 33487-2742
© 2016 by Taylor & Francis Group, LLC
CRC Press is an imprint of Taylor & Francis Group, an Informa business
This book contains information obtained from authentic and highly regarded sources. Reasonable efforts have been
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P r e fa c e xvii
Acknowledgments xxi
Authors xxiii
Chapter 1 Introduction to S o f t wa r e E n g i n e e r i n g 1
1.1 Introduction 1
1.2 Components of a Computer 1
1.3 Building the Software Products 2
1.4 What Is Software Engineering? 4
1.5 Why Software Engineering? 4
1.5.1 Reduction of Development Costs 5
1.5.2 Reduction of Development Time 5
1.5.3 Increasing the Quality 6
1.6 Challenges in Software Engineering 6
1.7 Project Management and Software Engineering 7
1.8 Costs Involved in Software Development 7
1.9 Methodologies Used for Software Development 8
1.10 Some Careers in Software Engineering 8
1.11 Software Industry Size 9
1.12 Code of Ethics 9
1.13 Book Organization 9
1.14 Chapter Summary 11
Recommended Reading 11
C h a p t e r 2 S o f t wa r e E n g i n e e r i n g M e t h o d o l o g i e s 13
2.1 Introduction 13
2.2 Why a Methodology? 14
2.3 Agile Methodologies 14
2.4 Waterfall Model 15
2.4.1 Details of the Waterfall Model 15
2.4.2 Salient Features of the Waterfall Model 16
v
vi C o n t en t s
C h a p t e r 3 F e a s i b i l i t y S t u dy 51
3.1 Introduction 51
3.2 Feasibility Study for Software Projects 52
3.3 Finding the Economic Feasibility of Requirements 53
3.3.1 Build/Buy Decision 54
3.3.2 Budget Instead of Cost Analysis 55
3.4 Finding the Technical Feasibility of Requirements 55
3.4.1 Difficult-to-Figure Scenarios 56
3.4.2 When Is Feasibility Study Not Required? 56
3.5 Prototyping 57
3.5.1 Throwaway Prototyping 58
3.5.2 Evolutionary Prototyping 59
3.5.3 Incorporating Prototyping in Software Development 60
3.6 Pilot Projects 61
3.7 Chapter Summary 62
Recommended Reading 63
C h a p t e r 4 S o f t wa r e R e q u i r e m e n t s S p e c i f i c at i o n s 65
4.1 Introduction 65
4.2 Software Engineering Methodologies and Requirements Management 66
4.2.1 Requirements Management in eXtreme Programming 66
4.2.2 Requirements Management in Scrum 67
4.2.3 Requirements Management in Waterfall 67
4.3 Implementation of the Requirements 68
4.4 Requirement Types 69
4.4.1 Functional Requirements 69
4.4.2 Nonfunctional Requirements 70
4.5 Sources of Requirements 72
4.6 Categories of Users 73
4.7 Software Requirement Life Cycle 74
4.8 Requirements Gathering (Elicitation) 76
4.8.1 Requirements Meetings 77
4.8.2 E-mail 77
4.9 Requirements Analysis 77
4.10 Requirements Specification 78
4.10.1 Use Cases 79
4.10.2 Relevance of Use Cases in Software Design 82
4.10.3 Use Case Example 82
4.11 Requirements Management 84
viii C o n t en t s
C h a p t e r 5 S o f t wa r e H i g h - L e v e l D e s i g n and Modeling 97
5.1 Introduction 97
5.1.1 Modeling Languages 100
5.2 Methodology Used 100
5.2.1 Rational Unified Process 100
5.2.2 Incremental Iterative Methodologies 100
5.2.3 Waterfall Methodology 101
5.3 How to Reduce Complexity in Software Design 101
5.4 Logical Design for Software Architecture 103
5.5 Architecture Design Patterns 104
5.5.1 Two-Tier Architecture Pattern 105
5.5.2 Three-Tier Architecture Pattern 106
5.5.3 n-Tier Architecture Pattern 107
5.6 Client–Server Architecture 108
5.7 Web-Based Architecture 108
5.7.1 Web Browser 110
5.7.2 Web Server 110
5.7.3 Application Server 111
5.7.4 Benefits of Web-Based Architecture 112
5.8 Service-Oriented Architecture 112
5.9 Software Component Design Fundamentals 113
5.10 Component Diagrams 116
5.10.1 Component Example 117
5.11 Data Flow Diagram 119
5.11.1 Data Flow Example 121
5.12 Software Design Patterns 122
5.12.1 Difference between a Class and a Component 122
5.12.2 Software Design Pattern Types 123
5.12.3 Creational Design Patterns 123
5.12.3.1 Abstract Factory 123
5.12.3.2 Builder 125
5.12.3.3 Factory Method 125
5.12.4 Structural Design Patterns 125
5.12.4.1 Adapter 125
5.12.4.2 Proxy 126
5.12.5 Behavioral Design Patterns 126
5.12.5.1 Command 126
5.12.5.2 Iterator 126
5.13 Programming Language Considerations 127
5.13.1 Size of Software Product 127
5.13.2 Type of Software Product 128
C o n t en t s ix
C h a p t e r 9 S o f t wa r e Te s t i n g ( V e r i f i c at i o n and Va l i d at i o n ) 279
9.1 Introduction 279
9.2 Software Testing and Software Engineering Methodologies 281
9.3 Introduction to Different Types of Software Testing 282
9.4 Introduction to Verification and Validation 282
C o n t en t s x iii
C h a p t e r 10 S o f t wa r e R e l e a s e 327
10.1 Introduction 327
10.2 Software Release and Software Engineering Methodology 328
10.3 Integration 328
10.4 Documentation 329
10.4.1 User Manual 329
10.4.2 Technical Manual 330
10.5 Release Cycles 330
10.5.1 Release Cycle for Waterfall Projects 330
10.5.2 Release Cycles for Incremental Building of Products 331
10.5.3 Difference between Alpha–Beta–Final Release and Incremental
Release 332
10.6 User Training 333
10.7 Deployment 333
10.8 Software Migration Strategies 334
10.9 Software Product Release Checklist 335
10.10 Chapter Summary 336
Recommended Reading 336
C h a p t e r 11 S o f t wa r e M a i n t e n a n c e 337
11.1 Introduction 337
11.2 Software Maintenance and Software Engineering Methodology 338
11.3 Production Environment Maintenance 338
11.4 Production Environment Monitoring 339
11.5 Maintenance Process 339
11.6 Types of Software Maintenance 341
11.7 Software Maintenance Strategies 342
11.8 Reverse Engineering 343
11.9 Chapter Summary 344
Recommended Reading 345
C h a p t e r 12 C o n f i g u r at i o n and Ve r s i o n M a n a g e m e n t 347
12.1 Introduction 347
12.2 Configuration Management and Version Control Concepts 349
12.2.1 Artifact Versions and Many Copies 350
12.2.2 Limitations of the File System of an Operating System 352
12.2.3 Software Build 353
12.2.4 File Locking 353
12.3 CVS Systems 353
12.3.1 Software Build on CVS Systems 354
12.3.2 Branching in CVS Systems 355
12.3.3 Branches and Different Product Releases 358
C o n t en t s xv
C h a p t e r 13 S o f t wa r e P r o j e c t M a n a g e m e n t 365
13.1 Introduction 365
13.2 Project Management and Software Engineering Methodologies 366
13.2.1 Project Management for Waterfall Projects 366
13.2.2 Project Management for Agile Projects 366
13.3 Project Planning 367
13.3.1 Project Planning for Waterfall Projects 367
13.3.1.1 Define the Scope of the Project 367
13.3.1.2 Create a WBS of the Tasks 368
13.3.1.3 Estimate the Effort for the Tasks 369
13.3.1.4 Calculate the Needed Resources 369
13.3.1.5 Map the Logical Dependencies between the Tasks
and Identify the Critical Path 370
13.3.1.6 Plot the Tasks on a Project Schedule 370
13.3.1.7 Calculate the Total Cost 371
13.3.1.8 Find Out Ways to Trade Off between Resource Usage
and Cost 372
13.3.1.9 Baseline the Project Plan 372
13.3.2 Project Planning for Agile Projects 373
13.4 Project Monitoring and Controlling 375
13.4.1 Project Monitoring and Control for Waterfall Projects 375
13.4.1.1 Gantt Chart 375
13.4.1.2 CPM/PERT 376
13.4.1.3 Critical Chain Method 377
13.4.1.4 Earned Value Management 378
13.4.1.5 Resource Control for Project Schedule Management 381
13.4.2 Project Monitoring and Control for Agile Projects 381
13.5 Project Team Management 384
13.6 Project Customer Management 384
13.7 Supplier Management 385
13.8 Chapter Summary 386
Recommended Reading 387
A pp e n d i x : A n s w e r s to Questions 389
Index 429
4 F o un dati o ns o f S o f t wa re En gineerin g
a programming language such as C++). Once the product is ready and tested, it is
shipped to the market. The software project manager oversees all these activities to
ensure that the things on the project go as per the project plan.
Similar to the measures (such as earthquake resistance, fire alarms, and fire exits)
taken while constructing the apartment, some considerations are needed to build a
software product. These considerations include security, performance, and reliability
of the product. These considerations will be addressed when the software product is
developed.
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