1. Software Design Principles Navigator Internal Workshop

2. Old Story Clean Simple Elegant Rigid Fragile Immobile Change with Requirement Out-of-Control Dependencies

3. Solution Software Development = Complexity Management Change with Requirement and Follow Principles OCP LSP DIP ISP Clean Simple Elegant Huge but still Clean Simple Elegant

4. Open Close Principle (OCP) A module should be Open for Extension but Close for Modification Solution: Polymorphism

5. Liskov Substitution Principle (LSP) Subclasses should be Substitutable for their Base Classes

7. Dependency Inversion Principle (DIP) Depend upon Abstractions. Don't depend upon Concretions. The Last Mile: Where to instantiate the concrete class?

8. Interface Segregation Principle (ISP) Many client specific interfaces are better than one general purpose interface

11. Thank you