Which factor is NOT part of entity relationship requirements?

The factors that are part of entity relationship requirements primarily focus on how entities interact with each other within a database. Cardinality refers to the nature of relationships in terms of quantity (e.g., one-to-one, one-to-many) and is essential for defining how many instances of one entity relate to another. Data constraints set rules for what values an entity's attributes can take, ensuring data integrity. Record link restrictions determine which records can be linked based on defined criteria, impacting the relationships between entities.

Data consistency, while important for overall database operation, is more of a consequence of correctly defined entities and their relationships rather than a direct requirement of the entity relationship model itself. It pertains to maintaining uniform and reliable data across the database but does not define how entities relate or the rules governing their relationships, making it distinct from the other factors listed.