THE LOGICAL LEVEL
The Top-Level specification of the CRM Data Architecture defines the 
Functional Areas and the data flows between the Areas.
The next level down consists of Entities in a Data Model, with one 
Model for each Functional Area, together with Interface definitions. 
A representative set of Interfaces is defined in order to show the 
approach and to give some examples.
In a CRM System, the CRM Application will be the obvious candidate to be the 
Owner for Customer-related Data, and will also be the central point around 
which other Applications will be grouped.
The design of the Logical Level will be presented as a Top-Level overview, supplemented with :-
Data Models
Data Interface Definitions
Data Dictionary to hold a Glossary of Terms
Definitions of Data Flows.