| # Introduction How to create and maintain business models. Business model is a generic term for a reference and a project model. Both models are built from a collection of model items created in the repository. A reference model represents a line of business or business typology. A project model represents a customer specific model. This chapter identifies and explains the mandatory sessions related to business models. Because all functionality related to a reference model is included in a project model, this chapter only deals with the creation of a project model. Therefore, almost every LN session that is discussed has its counterpart in the reference model business object, and can be started by carrying out the same steps as described in the project model. Some functionality described in this chapter only applies to project models. If this is the case, it will be stated in the text describing the project model specific sessions. |