Coupling

• A class depends on another if it uses objects of that class
• CashRegister depends on Coin to determine the value of the payment
• Coin does not depend on CashRegister
  
• High Coupling = many class dependencies
• Minimize coupling to minimize the impact of interface changes
• To visualize relationships draw class diagrams
  
• UML: Unified Modeling Language. Notation for object-oriented analysis and design