A much overlooked issue in Customer Data Integration projects is “Persistent Identification”.
Persons and companies are very often identified using their address data. But, what do you do if a person has moved from address A to address B. One, thing you really don’t want is that the person is added to database as a new person (INSERT). From that moment a duplicate person or company resides in your system. This should be prevented, by creating searching indexes which include the current and the previous address of the persons and companies in your database.