Abstract
This chapter discusses the entity-based data integration (EBDI). EBDI is the process of integrating and rationalizing the collective information associated with equivalent entities. Each reference may only provide a small portion of information about an entity, but combined with the information from other equivalent references a more comprehensive picture of the entity can emerge. EBDI is a two-step process in which the first step is an ER process and the second step integration of attributes. The Algebraic Model for ER, can be extended to provide a formal framework for defining the integration process. In particular the concept of entity equivalence is also applied to attribute equivalence to create integration entities and integration attributes, respectively. In the extended framework, an integration operator is defined in the context of a particular integration attribute as a function that assigns a value to each integration entity.
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