The IDEF3 method is designed for the Work Flow Modeling. IDEF3 is widely used for modeling of business processes in an organization at a lower level – while describing the work carried out in departments and in workplaces. It should be noted that the notation IDEF3 was the basis for creation of methodology for processes description ARIS еЕРС — «extended process chain, event-driven».
The basic graphical elements used in IDEF3 are rectangles and arrows. Rectangles serve to describe functions (works, processes), arrows serve to reflect in the model the sequence of functions through time or sequence of functions due to the flow of material resources.
To avoid ambiguity while describing workflows, additional objects are identified in IDFE3 which serve to display options of dividing and merging of workflows, realized under certain conditions. These objects are the logical symbols of three types:
- Logical operator «AND»;
- Logical operator «OR»;
- Logical operator— exclusive «OR».
Contrary to IDEF0 in IDEF3 method sides of the box reflecting a function (work, process) are not used to bind inputs of various types. Moreover, only one arrow can enter or exit the box. Otherwise, the IDEF3 rules of charting will be violated.
In the decomposition of processes in IDEF3 migration and tunneling of the arrows does not occur. The analyst must be concerned about the connection of process modeling and correctness of the decomposition.
It is appropriate to apply the IDEF3 method in the case of relatively simple processes in the lower level of decomposition, i.e. processes in the workplaces. In this case the chart of the process can be the basis for creation of documents regulating the work of the executors. It is obvious that the process in IDEF3 method is “flat”. It is rather difficult to create integrated models, which would combine the description of workflows and processes managing these works, using this notation. This fact becomes evident particularly when comparing the descriptions of the processes in IDEF3 and IDEF0 methods.