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Logical data model
The logical data model graphically represents the flow and
structure of data in a business environment. It comprises
facts, attributes, and hierarchies. Facts are numerical and
aggregatable, such as daily revenue, inventory data, and
hours worked. Once you have determined what your facts are,
attributes allow you to answer the questions about a fact,
such as a time frame for specific revenue totals. Hierarchies
are groupings of attributes, ordered to reflect their
relationship with other attributes. For example, you can
group the attributes Year, Month, and Date to form the Time
hierarchy.
Together, these three components—facts, attributes, and
hierarchies—form your logical data model.

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