A  Concept Domain is a subset of the Concepts of a  Business Dictionary that are relevant to an Operating Domain.

For instance, a "Sales Concept Domain" comprises at least the Concepts of "Customer" and "Order" while a standard "Marketing Concept Domain" comprises at least the Concepts of "Market Segment", "Product" and "Value Proposition".

A  Data Domain is subset of the enterprise’s data that are meant to be manipulated together in the context of business operations.

For instance, a "Sales"  Data Domain contains at least the following entities: Customers, Orders, Products.

Each Data Entity in a  Data Domain has CRUD characteristics. For instance, Products are read-only in a "Sales"  Data Domain, while Customers and Orders have all CRUD characteristics.

 Data Domains define functional data boundaries used both for Data Allocation to Business Systems (see Data Stores) and Data Governance for data stewardship (Data Catalogs).