- Done in Initial phase of planning in constructing a top-down approach.
- Get the business requirements from various sources like business docs,Functional teams,Business analysts,SME's and report users.
- It's a high level graphical represntation of a business of the organization.
- Starts with main subject area and identify the relationship with the other subject areas as well.
- Define entities in a subject area and their relationships,which is represented by cardinality(1:1,1:M,M:N)
- It is sent to functional team for review.
Eg: Bank has different subject areas like Savings,Credit cards,Investment,Retirement Plan Service.
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