How do you use the data?
Security controls and user access privileges.
Over what period of time are you interested in the data?
Cardinality and time dimensions.
Are all instances of each object the same?
Supertypes, subtypes, and aggregations.
What events occur that imply associations between objects?
Relationships and cardinalities.
Are there special circumstances that affect the way events are handled?
Integrity rules, cardinalities, time dimensions.