Behavioral Patterns: Chain of Resp - A way of passing a request between a chain of objects Command - Encapsulate a command request as an object Interpreter - A way to include language elements in a program Iterator - Sequentially access the elements of a collection Mediator - Defines simplified communication between classes Memento - Capture and restore an object's internal state Observer - A way of notifying change to a number of classes State - Alter an object's behavior when its state changes Strategy - Encapsulates an algorithm inside a class Template Method - Defer the exact steps of an algorithm to a subclass Visitor - Defines a new operation to a class without change