The recent FO variant of classic controller design includes an order parameter that changes the control effect of this operation. Lord Kelvin’s brother James Thomson invented a mechanical component with a constantly spinning disk and a ball (15[1])which accomplishes this operation (15[1])in mechanical computers. One control effect can be found using this operation applied to the (*) past values of the setpoint minus process variable error. This operation can be accomplished by an op-amp circuit (10[1])which feeds its voltage output back to its input (-5[1])through a feedback capacitor. This is the common operation applied to the exponential kernel that changes analysis of a circuit between the frequency and time domains in the Laplace and Fourier transforms. For 10 points, name this operation which for PID controllers is represented by the I and is the opposite of differentiation. ■END■ (10[1])