1362 Copyright © 2016, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 67 DOI: 10.4018/978-1-4666-9562-7.ch067 Customer Relationship Management and Data Mining: A Classifcation Decision Tree to Predict Customer Purchasing Behavior in Global Market ABSTRACT In the global market of today, Customer Relationship Management (CRM) plays a fundamental role in market-oriented companies to understand customer behaviors, achieve and maintain a long-term relationship with them, and maximize the customer value. Moreover, the digital revolution has made information easy and fairly inexpensive to capture. Thus, companies have stored a large amount of data about their current and potential customers. However, this data is often raw and meaningless. Within the CRM framework, Data Mining (DM) is a very popular tool for extracting useful information from this data and for predicting customer behaviors in order to make proftable marketing decisions. This research aims to demonstrate the classifcation decision tree as one of the main computational data mining models able to forecast accurate marketing performance within global organizations. Particular attention is paid to the identifcation of the best marketing activities to which frms should concentrate their future marketing investments. The criteria is based on the loss functions that confrm the accuracy of this model. Niccolò Gordini University of Milan – Bicocca, Italy Valerio Veglio University of Milan – Bicocca, Italy