A Marovian Model of the University of Michigan Executive System A mathematical model of a computer's executive system is postulated and its parameters estimated with the aid of extensive data on the system's operation. Although simplifying assumptions are made, the results predicted by the model agree reasonable well with actual results. The model is used to study the effects of changes in the executive system and in one of its compilers. Further applications of the model are discussed. CACM September, 1967 Foley, J. D. CA670911 JB February 27, 1978 2:50 PM 1533 4 1533 1533 4 1533 1604 4 1533 1951 4 1533 2667 4 1533 2668 4 1533 1224 5 1533 1533 5 1533 1533 5 1533 1533 5 1533 1604 5 1533 1916 5 1533 1533 6 1533 666 6 1533