which subclass of information filtering system was work of John Thomas Riedl
Recommender system A recommender system or a recommendation system (sometimes replacing "system" with a synonym such as platform or engine) is a subclass of information filtering system that seeks to predict the "rating" or "preference" that a user would give to an item.
Insurance Regulatory Information System The Insurance Regulatory Information System (IRIS) is a database of Insurance companies in the United States run by the National Association of Insurance Commissioners. IRIS is designed to provide information about insurers' financial solvency.