which subclass of information filtering system was work of John Thomas Riedl
John T. Riedl John Thomas Riedl (January 16, 1962 – July 15, 2013) was an American computer scientist and the McKnight Distinguished Professor at the University of Minnesota. His published works include highly influential research on the social web, recommendation systems, and collaborative systems.
Standard data system In work measurement, a standard data system is a database of normal time values, usually organized by work elements that can be used to establish time standards for tasks composed of work elements similar to those in the database.