SOLID

• Single Responsibility Principle
• Open-Closed Principle
• Liskov Substitution Principle
• Interface Segregation Principle
• Dependency Inversion Principle

Single Responsibility Principle

A class should have one, and only one, reason to change.

Open-Closed Principle

You should be able to extend a classes behavior, without modifying it.

Liskov Substitution Principle

Derived classes must be substitutable for their base classes.

Interface Segregation Principle

Make fine grained interfaces that are client specific.

Dependency Inversion Principle

Depend on abstractions, not on concretions.