Getting Started with Software Engineering

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Introduction
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Getting started with software engineering

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 1

Objectives
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To introduce software engineering and to explain its importance To set out the answers to key questions about software engineering To introduce ethical and professional issues and to explain why they are of concern to software engineers

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 2

Topics covered
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FAQs about software engineering Professional and ethical responsibility

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 3

Software engineering
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The economies of ALL developed nations are dependent on software More and more systems are software controlled Software engineering is concerned with theories, methods and tools for professional software development Software engineering expenditure represents a significant fraction of GNP in all developed countries Software Engineering, 6th edition. Chapter 1 Slide 4

©Ian Sommerville 2000

Software costs
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Software costs often dominate system costs. The costs of software on a PC are often greater than the hardware cost Software costs more to maintain than it does to develop. For systems with a long life, maintenance costs may be several times development costs Software engineering is concerned with costeffective software development

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 5

FAQs about software engineering
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What is software? What is software engineering? What is the difference between software engineering and computer science? What is the difference between software engineering and system engineering? What is a software process? What is a software process model?

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 6

FAQs about software engineering
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What are the costs of software engineering? What are software engineering methods? What is CASE (Computer-Aided Software Engineering) What are the attributes of good software? What are the key challenges facing software engineering?

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 7

What is software?
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Computer programs and associated documentation Software products may be developed for a particular customer or may be developed for a general market Software products may be • • Generic - developed to be sold to a range of different customers Bespoke (custom) - developed for a single customer according to their specification

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 8

What is software engineering?
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Software engineering is an engineering discipline which is concerned with all aspects of software production Software engineers should adopt a systematic and organised approach to their work and use appropriate tools and techniques depending on the problem to be solved, the development constraints and the resources available

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 9

What is the difference between software engineering and computer science? l

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Computer science is concerned with theory and fundamentals; software engineering is concerned with the practicalities of developing and delivering useful software Computer science theories are currently insufficient to act as a complete underpinning for software engineering

©Ian Sommerville 2000

Software Engineering, 6th edition. Chapter 1

Slide 10

What is the difference between software engineering and system engineering? l

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System engineering is concerned with all aspects of computer-based systems development including hardware, software and process engineering. Software engineering is part of this process System engineers are...
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