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User interfaces for recommender systems Recommender systems provide a valuable support for users who are searching for products and services that match their preferences and needs. There are three basic approaches to the recommendation of products and services. Collaborative techniques (Konstan et al. 1997 ) calculate recommendations by determining nearest neighbors whose rating behaviors are similar to the one of the active user. In this context, items are recommended which are not known bydoi:10.1007/s11257-012-9120-5 fatcat:mijh7tqm5zeufgdkjhzddfsvku