According to the "Glossary for MANAGING HUMAN RESOURCES" (State University of New Jersey), customerization means "viewing everybody, whether internal or external to the organization, as a customer and then putting that customer first."

http://www.rci.rutgers.edu/~schuler/HRglossary.htm



--------------------------------------------------
Note added at 2002-08-29 18:33:07 (GMT)
--------------------------------------------------

Taking a second look at this question, I see that the language pair is English>Arabic, not English>English. Obviously the above answer would not be very helpful.

I also see that the last part of the answer was missing.

The Arabic term I would suggest, based on the above English definition, is

أولوية الزبون

In my personal opinion "Customerization" means to customize practices, products & employees in a business to meet the needs of customers. Therefore, I suggest:
التحضير لتلبية احتياجات الزبون