The program will tell the CPU how to process the input information and what form to send the output in. For example, we might use a keyboard to send some text input into the computer.

M. D. McKay, R. J. Beckman, W. J. Conover, A Comparison of Three Methods for Selecting Values of Input Variables in the Analysis of Output from a Computer Code, Technometrics, Vol. 21, No. 2 (May, ...