Object Oriented Analysis and Design models are often presented without clarifying the viewpoint represented by the model. By default, these models denote an implementation viewpoint that visualises the structure of a computer program

Computer program

A computer program is a sequence of instructions written to perform a specified task with a computer. A computer requires programs to function, typically executing the program's instructions in a central processor. The program has an executable form that the computer can use directly to execute...

. Mixed viewpoints do not support the fundamental separation of interfaces

Interface (computer science)

In the field of computer science, an interface is a tool and concept that refers to a point of interaction between components, and is applicable at the level of both hardware and software...

 from implementation

Implementation

Implementation is the realization of an application, or execution of a plan, idea, model, design, specification, standard, algorithm, or policy.-Computer Science:...

 details, which is one of the primary benefits of the object-oriented paradigm.

See also

• Class-Responsibility-Collaboration card
  Class-Responsibility-Collaboration card
  Class Responsibility Collaboration cards are a brainstorming tool used in the design of object-oriented software. They were proposed by Ward Cunningham and Kent Beck....
  
  
• Unified Modeling Language
  Unified Modeling Language
  Unified Modeling Language is a standardized general-purpose modeling language in the field of object-oriented software engineering. The standard is managed, and was created, by the Object Management Group...
  
  
• Object-oriented analysis
• Object-oriented design