increased usage and loyalty, while actively reducing churn, by deliver-
ing a more cost-effective and intuitive service for end users. With a
strategic focus on the mobile and digital TV markets, the company de-
velops and designs applications specifically for these markets.
In this case study we focus on an emerging information overload
problem associated with the digital TV domain—the problem of lo-
cating relevant television information as we move toward hundreds
and thousands of available TV channels. We argue that such develop-
ments will signal an end to the traditional TV guides, and that the only
effective solution is the automatic personalization of programming
content. We describe the PTV system, a personalized electronic pro-
gram guide (EPG), ...