Objects Need to Collaborate ◆ Objects are useless unless they can collaborate to solve a problem. Each object is responsible for its own behavior and status. No one object can carry out every responsibility on its own. How do objects interact with each other? They interact through messages. Object Oriented Analysis and Design 8Object Oriented Analysis and Design 8 Objects Need to Collaborate  Objects are useless unless they can collaborate to solve a problem. ▪ Each object is responsible for its own behavior and status. ▪ No one object can carry out every responsibility on its own.  How do objects interact with each other? ▪ They interact through messages