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Chapter 1 Introduction

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Title: Chapter 1: Introduction Author: User Last modified by: Latifa Created Date: 2/10/2008 9:49:37 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Chapter 1 Introduction


1
Chapter 1 Introduction
2
Overview
  • Objectives
  • FAQs about software engineering
  • Ethical and professional issues
  • SW engineering vs. Systems Analysis
  • Course Syllabus

3
Objectives
  • Introduce what software engineering is and why it
    is important
  • Understand ethical and professional issues that
    are important for software engineers
  • Understand the relation between this course and
    the systems analysis and design
  • View of topics to be discussed this course

4
Class Activity Technology and us
  • With your team write down a list of everyday
    devices we use that contain software?

5
Software development crises
  • Projects were
  • Late
  • Over budget
  • Unreliable
  • Difficult to maintain
  • Performed poorly

6
Software errors... the cost
  • Errors in computer software can have devastating
    effects

7
CNN Computer glitch delays dozens of UK flights
  • Saturday 3rd October 2009-London, England (CNN)
  • Dozens of flights from the UK were delayed
    Saturday after a glitch in an air traffic control
    system in Scotland, but the problem was fixed a
    few hours later.
  • The agency said it reverted to backup equipment
    as engineering worked on the system.
  • The problem did not create a safety issue but
    could cause delays in flights.
  • Read more at
  • http//edition.cnn.com/2009/WORLD/europe/10/03/uk.
    flights.delayed

8
Loss of the Mars Climate orbiter in 1999 because
an error in a Metric to English conversion
formula (pounds and Kilograms)1
9
Ariane 5 Explosion
  • Caused by an overflow error.
  • Watch the video http//www.youtube.com/watch?vz-r
    9cYp3tTE

10
Therefore..
A well-disciplined approach to software
development and management is necessary. This is
called engineering.
11
Software engineering
  • The notion of software engineering was first
    proposed in 1968.

12
FAQs about software engineering
13
What is software?
  • Software is a product that software engineers
    design and build
  • It encompasses programs, documents, and data

14
What is Software Engineering?
  • An engineering discipline that is concerned with
    all aspects of software production from the early
    stages of system specification to maintaining the
    system after it has gone into use 4

15
Software Types
  • There are two types of software products
  • Generic products
  • Customized or bespoke products

16
What is the difference between software
engineering and computer science?
  • Computer science?
  • Theory and fundamentals
  • Software engineering?
  • Practicalities of delivering useful software
  • Software engineers need computer science
    knowledge

17
What is the difference between software
engineering and system engineering?
  • System engineering?
  • Hardware Software Process
  • Older than software engineering
  • Software engineering is part of system
    engineering

18
What is a Software Process?
  • Set of activities and associated results that
    produce a software product.
  • There are four fundamental activities common to
    all software process models
  • SW specification
  • What does the customer need Requirements?
  • What are the constraints?
  • SW development
  • Design programming
  • SW validation
  • Checking whether it meets requirements
  • SW evolution
  • Modifications (e.g. customer/market)

19
What is a Software Process Model?
  • A simplified description of a SW process that
    presents one view of that process
  • Examples of process perspectives are
  • Workflow perspective
  • Sequence of activities Human Actions
  • What is input, output, and dependencies
  • Data-flow perspective - information flow
  • Activities transformations of information
  • How the input is transformed into output
  • Role/action perspective
  • What is the role of people step of the process?

20
What is a Software Process Model?
21
What are the costs of SW engineering?
  • No simple answer, depends on
  • The process used, and
  • The type of software being developed
  • Each generic approach has a different profile of
    cost distribution.
  • Roughly 60 of costs are development costs, 40
    are testing costs.
  • For custom software, evolution costs often
    exceed development costs.

22
Software engineering activity cost distribution
23
What are software engineering methods?
  • Structured approaches to software development
    which include system models, notations, rules,
    design advice and process guidance.
  • Model descriptions
  • Descriptions of graphical models which should be
    produced
  • Rules
  • Constraints applied to system models
  • Recommendations
  • Advice on good design practice
  • Process guidance
  • What activities to follow.

24
What is CASE?
  • CASE (Computer Aided Software Engineering)
  • Programs used to support software process
    activities such as system modeling, debugging,
    and testing
  • Some CASE tools include automatic code generation
    from diagrams.

25
What are the attributes of good software?
  • Some essential attributes

26
Activity
?What are the key attributes for..
27
What are the key challenges facing software
engineering?
28
Professional and Ethical responsibility
  • Please read from the book section 1.2 pages 14-17

29
SW engineering vs. Systems Analysis
  • What you studied in System Analysis course
    constitutes part of software engineering.
  • Software Engineering is a broader subject.
  • To be a software engineer, you must master
    several skills, one of which is analysis and
    design.

30
SW Engineering vs. Systems Analysis and Design
31
Syllabus
32
References
  • PRESSSUN-BULLETIN, The Binghamton Press Co.,
    Binghamton, NY, October 1,1999.
  • Software Hell Is there a way out?, BUSINESS
    WEEK, December 6, 1999.
  • IEEE Standards Collection Software Engineering,
    IEEE standard 610.12-1990, IEEE 1993.
  • Sommerville, Ian Software Engineering, 8th
    edition, Addison-Wesley.
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