Trygve Mikkjel Heyerdahl Reenskaug (born 21 June 1930) is a Norwegian computer scientist and professor emeritus of the University of Oslo. He formulated the model–view–controller (MVC) pattern for graphical user interface (GUI) software design in 1979 while visiting the Xerox Palo Alto Research Center (PARC). His first major software project, Autokon, produced a successful computer-aided design – computer-aided manufacturing (CAD/CAM) program which was first used in 1963, and continued in use by shipyards worldwide for more than 30 years. Reenskaug described his early Smalltalk and object-oriented programming conceptual efforts as follows: MVC was conceived as a general solution to the problem of users controlling a large and complex data set. The hardest part was to hit upon good names for the different architectural components. Model-View-Editor was the first set. After long discussions, particularly with Adele Goldberg, we ended with the terms Model-View-Controller. He has been ex