1. Theory of the human operator in control systems: I. The operator as an engineering system;Craik;Brit. J. Psychol.,1947
2. Theory of the human operator in control systems: II. Man as an element in a control system;Craik;Brit. J. Psychol.,1947
3. Functions of men in complex systems;Fitts;Aerospace Engineering,1962
4. Allocation of function between man and machines in automated systems;Jordan;J. of Applied Psychology,1963
5. Human skill as a determinate of allocation of function;Whitfield;Ergonomics,1967