A Process Model refers to a description of business flow (order of task group). In many cases, a diagram is drawn "from left to right" or "from top to bottom" on the basis of execution procedure of each task. As a concept, not only Flow Models but also Data Models, etc. are included. An example of element resolution of Process Models is as follows.

• Flow models (definition of diagram)
• Divergence conditions (definition of condition that cannot be written in diagram)
• Allocation models (definition of person in charge of each task)
• Data models (definition of input/output, visibility)

The main purpose of Process Models is to describe "how to work", and Process Models are expected to be comprehensible for a number of people. "Flow Models" or "Allocation models" are very important elements, and they are described in a diagram by a notation called BPMN or EPC.

Also, the diagram is called "Business Flow Chart" or "Business Process Diagram" or "Process Diagram", etc. Moreover, a collection of data of Process Models which contain various elements is sometimes called Process Archive. The format for it varies according to the information system (BPMS, ERP etc.).