“…It also proved simple to add rules, rules with exceptions and ripple-down rules (Compton and Jansen, 1990) to KRS in a principled fashion (Gaines, 1991c), provide an interactive graphical editor for knowledge structures represented as semantic networks (Gaines, 1991b), modularize KRS to accept new data types such as numbers and dates through plugins providing well-defined services (Gaines, 1993), solve the Sisyphus room allocation problem (Gaines, 1994b), extend our semantic network tools to support advances in description logics (Gaines, 2009), and express the logical foundations in terms of cognitive psychology (Gaines and Shaw, 2012a).…”