The Purpose of the Data Model Diagram template is to model the structure of data entities of an Information System and their relationships.
he purpose of the Data Flow Diagram is to document a system’s or part of a system’s data flows; the data input the system (or a process within the system) consumes and the data output the system produces.
A conceptual data model is a high level or coarse data model which is preliminary in structure, possibly abstract in content and sparse in attributes, that is intended to represent a business area.
The purpose of a Concept Model is to organize an enterprise’s vocabulary to support consistent and unambiguous communication about specific problem domains across business units.
The purpose of the Class Diagram template is to document the structural aspects of a system using the UML. Below, an example of a simple Class Diagram is shown