1. A method of controlling and optimizing the operation of a process having a plurality of independently controlled, manipulated variables and at least one controlled variable dependent on said manipulated variables, said method comprising the steps of: introducing test disturbances in said manipulated variables and measuring the effect of the disturbances on said controlled variable; calculating at discrete intervals of time from said introducing and measuring the magnitude of response of said controlled variable to a given change in one of said manipulated variables; measuring the present values of said manipulated variables and said controlled variable; using said calculated magnitude of response to calculate for discrete intervals of time a new set of moves for said manipulated variables for obtaining new values and for moving said controlled variable toward its optimum setpoint; and adjusting said manipulated variables in accordance with said new set of moves to reach said new values.