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The Unified Modeling Language ( UML) is a general-purpose, developmental, in the field of, that is intended to provide a standard way to visualize the design of a system. The creation of UML was originally motivated by the desire to standardize the disparate notational systems and approaches to software design. It was developed by, and at in 1994–1995, with further development led by them through 1996. In 1997 UML was adopted as a standard by the (OMG), and has been managed by this organization ever since.

In 2005 UML was also published by the (ISO) as an approved ISO standard. Since then the standard has been periodically revised to cover the latest revision of UML. History of object-oriented methods and notation Before UML 1.0 UML has been evolving since the second half of the 1990s and has its roots in the methods developed in the late 1980s and early 1990s. The timeline (see image) shows the highlights of the history of object-oriented modeling methods and notation. It is originally based on the notations of the, the (OMT) and (OOSE), which it has integrated into a single language.

Hired from in 1994 and after that the company became the source for two of the most popular object-oriented modeling approaches of the day: Rumbaugh's (OMT) and 's method. They were soon assisted in their efforts by, the creator of the (OOSE) method, who joined them at Rational in 1995. UML 1.x Under the technical leadership of those three (Rumbaugh, Jacobson and Booch), a consortium called the was organized in 1996 to complete the Unified Modeling Language (UML) specification, and propose it to the Object Management Group (OMG) for standardisation. The partnership also contained additional interested parties (for example, and ). The UML Partners' UML 1.0 draft was proposed to the OMG in January 1997 by the consortium.

During the same month the UML Partners formed a group, designed to define the exact meaning of language constructs, chaired by and administered by Ed Eykholt, to finalize the specification and integrate it with other standardization efforts. The result of this work, UML 1.1, was submitted to the OMG in August 1997 and adopted by the OMG in November 1997. After the first release a task force was formed to improve the language, which released several minor revisions, 1.3, 1.4, and 1.5. The standards it produced (as well as the original standard) have been noted as being ambiguous and inconsistent. Cardinality notation As with database Chen, Bachman, and ISO, class models are specified to use 'look-across', even though several authors (, Elmasri & Navathe amongst others ) prefer same-side or 'look-here' for roles and both minimum and maximum cardinalities. Recent researchers (Feinerer, Dullea et al.

) have shown that the 'look-across' technique used by UML and ER diagrams is less effective and less coherent when applied to n-ary relationships of order strictly greater than 2. Feinerer says: 'Problems arise if we operate under the look-across semantics as used for UML associations. Hartmann investigates this situation and shows how and why different transformations fail.' , and: 'As we will see on the next few pages, the look-across interpretation introduces several difficulties which prevent the extension of simple mechanisms from binary to n-ary associations.' UML 2 UML 2.0 major revision replaced version 1.5 in 2005, which was developed with an enlarged consortium to improve the language further to reflect new experience on usage of its features. Although UML 2.1 was never released as a formal specification, versions 2.1.1 and 2.1.2 appeared in 2007, followed by UML 2.2 in February 2009.

UML 2.3 was formally released in May 2010. UML 2.4.1 was formally released in August 2011. UML 2.5 was released in October 2012 as an 'In process' version and was officially released in June 2015.

There are four parts to the UML 2.x specification:. The Superstructure that defines the notation and semantics for diagrams and their model elements. The Infrastructure that defines the core metamodel on which the Superstructure is based. The (OCL) for defining rules for model elements. The UML Diagram Interchange that defines how UML 2 diagram layouts are exchanged The current versions of these standards are:. UML Superstructure version 2.4.1. UML Infrastructure version 2.4.1.

OCL version 2.3.1. UML Diagram Interchange version 1.0. It continues to be updated and improved by the revision task force, who resolve any issues with the language. Design UML offers a way to visualize a system's architectural blueprints in a diagram, including elements such as:. any (jobs);.

individual of the system;. and how they can interact with other;. how the system will run;. how entities interact with others (components and interfaces);.

external. Although originally intended for object-oriented design documentation, UML has been extended to a larger set of design documentation (as listed above), and been found useful in many contexts. Software development methods UML is not a development method by itself; however, it was designed to be compatible with the leading object-oriented software development methods of its time, for example, and especially that it was originally intended to be used with when work began at Rational Software.

Modeling It is important to distinguish between the UML model and the set of diagrams of a system. A diagram is a partial graphic representation of a system's model. The set of diagrams need not completely cover the model and deleting a diagram does not change the model. The model may also contain documentation that drives the model elements and diagrams (such as written use cases). UML diagrams represent two different views of a system model:. Static (or structural) view: emphasizes the static structure of the system using objects, attributes, operations and relationships. It includes and.

Dynamic (or behavioral) view: emphasizes the dynamic behavior of the system by showing collaborations among objects and changes to the internal states of objects. This view includes, and. UML models can be exchanged among UML tools by using the (XMI) format.

In UML, one of the key tools for behavior modelling is the use-case model, caused. Use cases are a way of specifying required usages of a system. Typically, they are used to capture the requirements of a system, that is, what a system is supposed to do. Diagrams Structural UML diagrams. Behavioral UML diagrams.

Illustration of the Meta-Object Facility The Object Management Group (OMG) has developed a architecture to define the UML, called the. MOF is designed as a four-layered architecture, as shown in the image at right. It provides a meta-meta model at the top, called the M3 layer. This M3-model is the language used by Meta-Object Facility to build metamodels, called M2-models. The most prominent example of a Layer 2 Meta-Object Facility model is the UML metamodel, which describes the UML itself.

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These M2-models describe elements of the M1-layer, and thus M1-models. These would be, for example, models written in UML. The last layer is the M0-layer or data layer. It is used to describe runtime instances of the system. The meta-model can be extended using a mechanism called. This has been criticised as being insufficient/untenable by and Cesar Gonzalez-Perez in 'Uses and Abuses of the Stereotype Mechanism in UML 1.x and 2.0'.

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Adoption UML has been marketed for many contexts. It has been treated, at times, as a design, which leads to problems. UML misuse includes overuse (designing every part of the system with it, which is unnecessary) and assuming that novices can design with it. It is considered a large language, with many. Some people (including ) feel that UML's size hinders learning (and therefore, using) it.

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See also.