August William Scheer, a pioneer in the process modelling, describes a process as a succession of events and functions. Is an event of the trips for a function or also an activity. This kind of the process modelling is illustrated in so-called event-controlled process chains (EPK). In principle it gives to be illustrated apart from the EPK a multiplicity from so-called process modelling methods to those a business process can.
By the reality is abstracted and illustrated by the modelling of business processes by a relevant section. Complex operational sequence can be represented and been available in this way for analyses and simulation.
To the illustration of the business processes software tools can be used. Bullinger (2002) differentiates between tools to visualization, modelling, simulation and CASE Tools. Integrated solutions, which extend the functions mentioned by aspects Workflow and EAI, increasingly Business Process management systems firmieren under the designation. In order to be able, become to arrange the graphic notation implementation the appropriate specifications into the system imported or there defines, as far as no suitable import possibilities exist. The finished process definitions can to be processed directly by integrated Businesses a Process engine or left in a form to export itself, which can be imported then by an integration platform and/or the Process engine integrated there.
A goal of the modelling is it to reduce complex circumstances of the reality and to make so an analysis possible of the business processes. The moreover one legal defaults play a role for the documentation of processes. The business process modelling orients itself at the established proceeding of the modelling: First the purpose of the modelling is to be determined. It is to be considered that business processing concepts in the meantime frequently a multi-functional use experienced (see above). Further the model addressees are to be determined, since the characteristics of the model their requirements which can be provided to become fair to have. It follows the determination of the original - a business process -, which can be modelled.
According to the objective of the modelling the characteristics of the business process are specified, which are to be illustrated in the model. These are usually not only the process constituent functions, including the relations existing between them, but still another number of further characteristics. In the literature are beside organizational units among other things still inputs, outputs, resources, information, media, transactions, events, conditions, conditions, operations and methods.
In practice combinations of informaler, semiformaler and formal models are common: informale textuelle descriptions for explanation, semiformale diagram for visualization and formal-linguistic representation for the support of simulation and transmission in executable code.
Computer-based tools offer today a large support particularly during the semiformalen business process modelling. With the production of target models in the surrounding field reference processing concepts use, which prototypische, generic process structures are adapted to give and by modification to the concrete situation particularly, find customizing.
For the description of business processes Gadatsch differentiates 2005 between script-based and diagram-based methods for business process modelling. The diagram-based methods are divided into object-oriented, data flow-oriented and diagram-based methods. Most well-known representative of the supervisory data flow-oriented methods for business process modelling at least in the German-speaking countries are the event-controlled process chains (EPK's). Object-oriented methods on basis of the UML entrance into the business process modelling find in addition, increasing. A further method for the graphic description of business processes is the Businesses Process Modeling notation (BPMN). With the specification increasingly XML languages are used. The most important are Business Process Modeling LANGUAGE (BPML) and Business Process Execution LANGUAGE (BPEL) of the Businesses Process management initiative (BPMI), as well as the XML Process definition LANGUAGE (XPDL) the Workflow management Coalition (WfMC).
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