There are a number of reasons why databased or organizations are increasingly polluted. First of all customers are not always equally careful when it comes to sending the correct address data. After relocating there a many different matters that should not be forgotten, and with all the persons and organizations that need to receive an address change, a company might slip through the cracks occasionally. However, the problem is often the organization itself. Companies and even departments collect an increasing amount of data to be able to make substantiated statements on customer behavior. But as the data increases, so does the probability that there are errors included. An address change is received but not processed correctly. That is often how a financial department records the address change, but the sales department is still using the old address to send a brochure to.