Metcalfe's correspondence card did not receive much more media attention. An exception is William Kent (1918), who even listed this card as forth basic card of Metcalfe's system. He acknowledged, that "the card system proposed by Capt. Metcalfe has been generally adopted in Government shops, but, as shown in some of the testimony given before Congressional Investigating Committees, much yet remains to be done in the way of cutting out unnecessary red tape..."
