A Specificationlevel diagram that descibes the solution A Conceptual level diagram does notĭefine source code, nor should it. Miscom-munication between programmers and analysts. Failure to recognize the level of a diagram is the source of significant It is unfortunate that the diagrams themselves don’t communicate what level they areĭrawn at. Pro-cessing, or programs, the Specificationmodel describes part of a program. Whereas the Conceptualmodel says nothing at all about computers, data This source code defines Animal and Dog as classes connected by an inheritance However, the same diagram at the Specificationor Implementationlevel has a much We might beĪsserting that our pet dog, Sparky, is an animal or we might be asserting that dogs, as aīiological species, belong to the animal kingdom. This diagram depicts two entities named Animal and Dogconnected by generaliza-tionrelationship. We can create aĬonceptualUML diagram that respresents this sentence. Semantic rules and therefore their meaning can be ambiguous and subject to interpretation.Ĭonsider, for example, the following sentence: A dog is an animal. They are a shorthand used describeĬon-cepts and abstractions that exist in the human problem domain. Rather they are related to humanlanguage. On the other hand, diagrams at the Conceptuallevel are not strongly related to sourceĬode. Such diagrams have very little ambiguity, and a great deal of formality. As such there are rules and semantics that diagrams at these levels must follow. Likewise it is the intent for an Implementationlevel diagram to describe existing sourceĬode. Indeed it is the intent for a Specificationlevel diagram to be turned into source code. Specificationand Implementationlevel diagrams have a strong connection to sourceĬode. These three different levels as Conceptual, Specification, and Implementation. Software design, or an already completed software implementation. One can use it for drawing diagrams of a problem domain, a proposed The Unified Modeling Language (UML) is a graphical notation for drawing diagrams of
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