An object contains all of the data, logic and interface requirements in one atomic unit. Object modeling is based on the interrelationships between these self-contained islands of functionality. It is a decentralized process which stresses the complete reusability of the specific components for many business tasks. Data Modeling Entity-relationship diagrams are the basic tool of data modeling. The relationships between entities is a critical aspect.
Binary relationships involve two entities.
We briefly described meta-data as information about the entities and their attributes.