Content-based recommenders are systems that exploit detailed knowledge about the items in the catalog for generating adequate product proposals. In that context, query relaxation is one of the basic approaches for dealing with situations, where none of the products in the catalogue exactly matches the customer requirements. The major challenges when applying query relaxation are that the relaxa...

The author reviews the book that B. F. Skinner considered to be his most important work, namely Verbal Behavior in terms of its content and effect on the field. He considers such elements as the paucity of experiments, the host of allusions to literature and the masterful behavior analysis directed at elucidating verbal behavior, the latter constituting an admirable example of how behavior anal...