GE 393Software Design

Design Patterns: Elements of Reusable Object Oriented Software

ByGamma, Helm, Johnson and Vlissides

The practice of Programming , By

Brian W. Kernighan

Software Creativity, By Robert L. Glass

Serious Creativity By Edward de

Bono

Presented By Agnita Pandian

What is Software Design??

• The hardest part in software generation

• It’s a problem-solving activity

• the world of technology and the world of human purposes---bring the two together

Cont…

• “Beauty is in the eye of the beholder”

• Software design means different things to different people

• Is performance important? Is it ease of maintenance? ease of use? security? Modularity?

Creativity generates truly great

software • Human Imagination is the only limit e.g. Lotus • Good software comes when you take

time to explore the design space of possibilities

e.g. Windows• So they say, Generating Software is one

of the most creative activity by humanse.g. Compilers

Software Engineering model • Reduces our ability to be creative• Methodologies entails repeatable

results• Reuse of the software• Ship dates• Simple Example:

Why do you need Creativity??• As Edward de Bono argues,

"...unless your job involved creativity, you are (eventually) replaceable by a computer."

• The right design style for the right product gives structure for future

• Innovation• Ease our lifestyles• e.g. Put together different modules

to make a PC

The real concern is…….

• To design modules that cut development time

• To design software that runs more efficiently using minimum resources

• Ultimately, you want to reduce costs…

Object Oriented Software • Smarter coding• Objects• Class• Inheritance• Polymorphism• Overloading• Encapsulation

Creativity

• Sorting• Hash Tables• Data Structures• Internet• Interfacing w/Hardware• Testing

Learn to be creative

• Specify completely the user's whole experience

• Balance your goals and constraints

• Know the programming language well

References

• Robert L. Glass, Software Creativity; Prentice Hall 1995

• Serious Creativity by Edward de Bono • Programming Pearls by Jon Bentley• Bringing Design to Software Edited by

Terry Winograd