1. SE___Lecture_01__Introduction_.ppt

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Introduction toSoftware Engineering

7th January 2013

Lecture 01-02

Prof. Partha Pratim Das
http://www.dak.iitkgp.ernet.in/


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SOFTWARE ENGINEERING

Soft Construction

03-Jan-2012 Introduction to Software Engineering 2


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Engineering:Skills of Construction

Civil Engineering

Construction of Buildings

Mechanical Engineering Construction of Automobiles

Electrical Engineering

Construction of Power Plants

Software Engineering

Development of Software



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What Software Engineering isNOT!

Programming

Data Structures

Algorithms

Design

Testing

Deployment

Maintenance

Construction!



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Evolution of Domains

Bridge Construction

Medicine

Airplanes Software Development



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Bridge Construction

Early Wood, Stone

Then Iron, Steel

Concrete Bridges

Constructing a bridge is different frominnovating a bridge (with new materialfor instance) for the first time

Engineers use well established metricsto design bridges they do not innovateat this stage



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MedicineHealth was thought to be restored by

purging, starving, vomiting or bloodletting

Surgeons and barbers specialized in thispractice

Widely practiced in 18th & 19th century

Declared quackery by 1900

Infection control

Survived surgery, died out of infection Germ theory and sterility came only in late

1800s (Lister)

Current rate of infection < 2.5%



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Airplanes

400 BC Chinese fly kite aspiringhumans to fly

For centuries, we tried to fly like

birds disastrous

Steam powered, hot air

Gliders, single man

Engine powered 1903 Wright brothers first flight 12

seconds, 120 feet,10 feet altitude



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Software

Relatively nascent field in comparison

Machines are getting faster or more

powerful Are we getting better in delivering

software applications though?



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Success (or Lack thereof)

How successful are we in developingsoftware?

Less than 10% of software projects

succeed! Criteria for success?

On time,

Within budget,

Feature complete,

Works (failure free)

Why is it so hard to get this right?03-Jan-2012 Introduction to Software Engineering 10


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Change In Projects

Changes From Requirements

Customers Learn from the Solution

Business Environment and Conditions Change

Business Processes are Re-engineered

Changes From Technology

Tools/Platform Release New Versions

Actual Tool/Platform Capabilities May Vary from Plans

Changes From People Interactions are Complex

Individual Behavior is Unpredictable

03-Jan-2012 11Introduction to Software Engineering


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Whats Engineering?

the application of science andmathematics by which the properties of

matter and the sources of energy in natureare made useful to people

the design and manufacture of complexproducts



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If software engineering like manufacturingor designing a manufacturing plant?

Is it like making another cell phone or making

of cell phones (took 37 years forcommercialization)?

Manufacturing is predictive

You can measure and control quality, quantity

Designing a manufacturing plant iscreative/innovative



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Most software development isinnovative process rather thanpredictive manufacturing

Requires great deal of innovation,interaction / communication



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Course: Software Engineering

We demystify software construction andlearn the good practices



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MAJOR THEMES IN SE

Course Agenda



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Agenda

Software as a product

Clients and their needs

Quality

Requirements and specification

Usability

Evolution

Software design

Software architecture

Object-oriented design


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Agenda

Software Processes

Coding

Reading

Review

Source Management

Debugging

Testing

Reliability

Verification

Documentation

Quality

Maintenance


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Agenda

Project management

Personnel management

Economic, legal, and social factors

Standards


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Thank You

Documents

1. SE___Lecture_01__Introduction_.ppt