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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. Mixed viewpoints do not support the fundamental separation of interfaces from implementation details, which is one of the primary benefits of the object-oriented paradigm. In Object Oriented Analysis and Design there are three viewpoints: The business viewpoint (the information that is domain specific and matters to the end user), the specification viewpoint (which defines the exposed interface elements of a class), and the implementation viewpoint (which deals with the actual internal implementation of the class).〔http://sourcemaking.com/antipatterns/ambiguous-viewpoint〕 If the viewpoint becomes mixed then these elements will blend together in a way which makes it difficult to separate out and maintain the internals of an object without changing the interface, one of the core tenets of Object Oriented Analysis and Design.〔 ==See also== *Class-Responsibility-Collaboration card *Unified Modeling Language *Object-oriented analysis *Object-oriented design 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ambiguous viewpoint」の詳細全文を読む スポンサード リンク
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