An activity that includes producing a Data Requirement Model that shows the business attributions of Forms and the verbs of Relationships between Forms. The model shows attributes, their data format and the formula that defines them. Structurally, the Data Requirement Model (DRM) is a 1st Normal Form (1BNF) detailing of the attributes in Forms present in the CDM, including the use of attribute domains, business rules about expected values, default values, data formats, data ordering, uniqueness cases, type discrimination and referential integrity. Attribute names and/or their characteristics may be color coded to indicate additions, deletions or changes.
This is a modeling activity that TDM introduces. Both the data model and the activity surrounding it are missing from pre-TDM data modeling and data architecture practices.