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==Language==
[[File:UML History.jpg|450px|thumbnail|right|
The notation used for modelling is a language of graphical elements that imply design based on convention. Many conventions have been devised and they vary in formality. It may be relatively informal in nature, or consist of predefined graphical templates or consist of a formally defined [[grammar]].
A modeling language is often associated with a object-oriented [[software development methodology]] since a methodology often spawns a language. The modeling language defines the elements of a model, such as [[class (programming)|classes]], [[method (programming)|methods]], [[property (programming)|properties]], etc. The methodology defines the steps developers take to create and maintain a software system in relation to the models. For example, the [[Booch method]] may refer to [[Grady Booch]]'s standard for diagramming, his methodology, or both. Or the Rumbaugh [[Object Modeling Technique]] is both a set of diagrams and a process model for developing object-oriented systems.
▲[[File:UML History.jpg|450px|thumbnail|right|Important milestones in the evolution of the UML: One of the most significant object modeling languages currently in use.<ref>{{cite web|last=Riley|first=Mike|title=A Special Guide-MDA and UML Tools: CASE 2.0—or the Developer's Dream|url=http://www.drdobbs.com/a-special-guide-mda-and-uml-tools-case-2/184415500|work=drdobbs.com|publisher=Dr. Dobb's|access-date=19 December 2013|date=April 1, 2006|quote=If it weren't for the dominance that UML has gained over the industry, MDA and related modeling standards couldn't even exist.}}</ref>]]
In the early years of the object-oriented development there were several competing modeling and methodology variants. Booch and Rumbaugh were two of the most popular, and [[Ivar Jacobson]]'s Objectory, Shlaer-Mellor, and Yourdon-Coad were also popular. Starting in the mid-1990s, efforts began to harmonize modelling languages; to reconcile the leading models and focus on one unified specification. The graphic shows the evolution of and adoption of the [[Unified Modeling Language]] (UML).
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==See also==
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== References ==
{{reflist}}
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