Section C.1. Take One Part OOAD...

C.1. Take One Part OOAD...

Grady Booch's approach was named Object-Oriented Analysis and Design (OOAD), or less formally, the Booch method. These grand titles encompassed a method that included a modeling language constructed of diagrams to show classes, state, state transitions, interactions, modules, and processes.

This formidable collection of diagrams was probably best known for its class notations, which were depicted as clouds and a selection of arrows with simple names such as has a that could be used to specify different types of inter-class relationships, as shown in Figure C-1.

Figure C-1. A cloud OOAD notation describes classes and the relationships between them

The cloud notational style and the simple naming of Booch's inter-class relationship arrows worked themselves into the hearts of adopters to such a degree that even to this day, they reminisce about the clouds. In fact the use of either the cloud notation or the rectangle notation for classes prompted some of the most vehement, and useless, arguments during the inception of UML.