IDEF0 diagrams are built within a logical grouping mechanism called a model. If you specify that the IDEF0 diagram that you are creating is a Context diagram, you must provide a model name. You can define the model properties using the IDEF0 model definition dialog box.

If the IDEF0 diagram that you are creating is not a Context diagram, then you do not have to specify a model. You can do this later, when you have more understanding of to which grouping it belongs.

To define the model, open the diagram properties of an open IDEF0 diagram (Edit, Diagram Properties or right-click the diagram workspace and select Diagram Properties ). Within the definition dialog for the model, you will see the name of the Model. Click Define to open the definition dialog box for the model.

The Description box is for free-format text that you can use to describe your model.

The Purpose box is for the reason for the model. For example, a model's purpose might be to understand the current manufacturing process so that improvements can be made to operations.

The Viewpoint box is for the perspective from which the model is being built. For example, a model could be built from the president of the company's point of view.

For Time Frame, toggle on As-Is if you are creating a model of an existing situation or To-Be if you are creating a model of a future situation.

You can assign a node tree diagram (see Node tree diagrams) to your model.