Open Closed Princple Rules

• Design should be opened for extensions and closed for modifications
• Isolate a responsibility for creating objects in a single module ([[Single Choice Principle]])
• Related patterns:
  • Template Method Design Pattern
  • [[Strategy Design Pattern]]
• [[Interface]] is suppler from the client's perspective, [[Abstract class]] is suppler from the developer's perspective.
• To overcome the problem of predicting the future, we rely on "[[agile design]]"