• Gathering Business Requirements - First Phase: Data Modelers have to interact with business analysts to get the functional requirements and with end users to find out the reporting needs.
• Conceptual Data Modeling(CDM) - Second Phase: This data model includes all major entities, relationships and it will not contain much detail about attributes and is often used in the INITIAL PLANNING PHASE.
• Logical Data Modeling(LDM) - Third Phase:
  This is the actual implementation of a conceptual model in a logical data model. A logical data model is the version of the model that represents all of the business requirements of an organization.
• Physical Data Modeling(PDM) - Fourth Phase: This is a complete model that includes all required tables, columns, relationship, database properties for the physical implementation of the database.

Conceptual Data Modeling(CDM)