Overview-Softwarre Engineering-Lecture Slides-Softwarre Engineering-Lecture Slides, Slides of Software Engineering

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Part I: OVERVIEW

IntroductionIntroduction

Software Engineering

Software Engineering

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Software is playing a pivotal role in the economies ofdeveloped nationsdeveloped nations.

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More and more modern day systems are softwarecontrolledcontrolled

Software Engineering

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Software engineering is concerned with theories,methods and tools for professional softwaremethods and tools for professional softwaredevelopment.

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Expenditure on software represents a

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Expenditure on software represents asignificant fraction of GNP in all developed countries.

FAQs about Software Engineering

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What is software?

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What is software engineering?

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What is the difference between software engineeringand computer science?

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What is the difference between software engineering

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and system engineering?

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What is a software process?What is a software process?

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What is a software process model?

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FAQs About Software Engineering

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What are the costs of software engineering?

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What are software engineering methods?

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What is CASE (Computer-Aided SoftwareEngineering)

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What are the attributes of good software?

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What are the key challenges facing softwareengineering?engineering?

What is Software?

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Software products may be– Generic - developed to be sold to a range of

different customers e.g. PC software such as Excelor Word.

• Bespoke (custom) - developed for a single

customer according to their specification.

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New software can be created by developing new

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programs, configuring generic software systems orreusing existing software.

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What is Software Engineering?

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Software engineering is an engineering discipline thati^

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is concerned with all aspects of software production.

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Software engineers should– Adopt a systematic and organised approach to

their work

• Use appropriate tools and techniques depending

on the problem to be solved, the development

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constraints and the resources available.

Software Engineering

COMPUTER

SCIENCE

CUSTOMER

Theories

ComputerFunctions

Problem

SOFTWARE Functions

SOFTWARE ENGINEERING

Tools andTechniques to Solve Problem

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Evolving Role of Software

• Early Years

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• Fourth Era

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• Batch orientation• Custom software
• Desktop systems• Object Oriented

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• Second Era
  • Multi-user, Real-time

Technologies

• Expert Systems

AI

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• Database• Product software
• AI, neural networks• Parallel computing

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• Third Era
  • Distributed systems
• Network computers

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• Low cost hardware

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Software Engineering vs Computer Science?

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Computer science is concerned with theory andf^

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fundamentals; software engineering is concernedwith the practicalities of developing and delivering

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useful software.

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Computer science theories are still insufficient to actas a complete underpinning for software engineering(unlike e.g. physics and electrical engineering).

Software Engineering vs System Engineering?

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System engineering is concerned with all aspects ofcomputer-based systems development includingcomputer-based systems development includinghardware, software and process engineering.Software engineering is part of this process

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concerned with developing the softwareinfrastructure, control, applications and databases inthe system.

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System engineers are involved in systemspecification, architectural design, integration anddeployment.

What is a Software Process?

There are 4 basic phases which are required processes

in every software process model:in every software process model:– Specification

• What the system should do and its development• What the system should do and its development

constraints

• Development

Development

• Production of the software system
  • Validation

Validation

• Checking that the software is what the customer wants
  • Evolution

Evolution

• Changing the software in response to changing

demands.

What is a Software Process Model?

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A simplified representation of a software process,

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presented from a specific perspective.

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Examples of process perspectives are– Workflow perspective - sequence of activities;– Data-flow perspective - information flow;

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• Role/action perspective - who does what. -^

Generic process models

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Generic process models– Waterfall– Iterative development– Component-based software engineering

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