![]() ![]() ![]() For the person who creates a diagram, it is probably easy to understand interrelationships. And there is also no ideal number of diagram elements per diagram as the size of a diagram increases, clarity and readability are often lost. There is no formula for determining a sensible number of diagrams to describe and visualise the interrelationships of a system or software development.In addition, opinions differ as to whether the documentation is easy to read and understand. Even if earlier versions were even more extensive, that is a lot of pages with a lot of information. The documentation of UML 2.5 is very extensive with 794 pages.The following criticism² is voiced, among others: And last but not least, various tools support the transformation of domain-oriented UML models into technical models with subsequent code generation so-called model-driven development.This also increases flexibility in the application. The Unified Modelling Language not only provides a graphical view of a system, but also includes a format for exchanging models or diagrams between different tools.Ideally, the modelling language also promotes the cooperation of all users such as software architects and software developers, business analysts, project managers or product managers.during the implementation or maintenance phase. The use of the modelling language ideally leads to a better understanding of the system to be developed or documented and can contribute to the reduction of possible costs, e.g.Through specialisation, each diagram already offers a benefit or added value in itself. Each diagram offers suitable elements with which specific information and contexts can be worked out and presented.And it can be used independently of sectors or industries and in all phases of a development. It is suitable, for example, for the specification, visualisation or documentation of systems or software. The modelling language is versatile and flexible.The use of the Unified Modeling Language offers some advantages, but may also have some disadvantages in practice. The profile diagram is used at the metamodel level to visualise user-defined stereotypes, property values and constraints.Īdvantages and disadvantages of the Unified Modeling Language In addition, the Unified Modeling Language also knows a diagram for metamodelling: And an interaction overview diagram links activities and processes to show permitted interactions between elements with decisions and information flows. A timing diagram shows objects interacting with each other during a defined period of time. The communication diagram – still called a collaboration diagram in earlier versions of UML – highlights selected messages that are used to sequence the communication between objects. The following interaction diagrams exist:Ī sequence diagram describes how objects and their instances exchange information in a certain order. Activity diagrams show the sequence of activities, processes in systems or business processes, and state machine diagrams – sometimes referred as state diagram – visualise a sequence of permitted states that an object can assume in its life cycle. It shows use cases with their relationships to other use cases and to other systems. And the package diagram is used to represent a group of model elements – the packages – and the dependencies between the packages of a model.Ī use case diagram visualises the behaviour of a system from the user’s point of view. The distribution diagram models the physical distribution of artefacts to nodes (hardware and software). A component diagram depicts the structure and relationship between different components of a system. A composition structure diagram shows the internal structure of a classifier and visualises the configuration of the elements that together determine the behaviour of the classifier. An object diagram describes a concrete instance of a class diagram at a defined point in time. In class diagrams, classes and the relationships between classes are modelled as association, aggregation, composition or generalisation. The variety of diagrams enables practical use across all phases of a development UML diagrams can be used, for example, for requirements documentation, the design of a software architecture, technical documentation or, with appropriate tool support, for the implementation of systems. And interaction diagrams visualise the interactive behaviour of a system and thus the flow of information in a system. A behaviour diagram visualises individual aspects of a system, the sequence of processes and their changes at runtime. Structure diagrams are all diagrams that model a static component of a system, in which the data change but not the structures of the elements and their relationships to each other. UML 2.5 includes a total of 14 diagrams, which are divided into three groups or diagram types: ![]()
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