Abstract
Recommendation has a long history as a successful application area of Artificial Intelligence. The demand of e-commerce platforms (e.g., amazon.com) to improve the accessibility of large product- and service assortments contributed to an increased popularity of recommendation technologies. Three basic technologies supporting the personalized recommendation of products and services are presented in this paper. In order to take into account the focus of this special issue, we provide a discussion of the application of those technologies in the tourism domain (e.g., recommendation of travel destinations) with a special focus on mobile environments.