This document discusses attributes in entity-relationship modeling. It defines attributes as properties that define entity types, and notes that attributes always have values. It describes five types of attributes: atomic/simple, composite, single-valued, multi-valued, and derived. Simple attributes are indivisible values like a phone number. Composite attributes combine simple attributes, like a name from first and last parts. Derived attributes provide values not stored in the database, like age from date of birth. Entities can have single or multiple attribute values. The document also outlines symbols used in entity relationship diagrams.