Thanks to Carol for putting up with me while I wrote this; to Jenni Hill, Joanna Kramer and Brit Hvide for editorial work; and to Mic Cheetham, Sharon MacLeod and Farah Mendlesohn for reading and commenting on the draft. As in the first two volumes, I must acknowledge Brian Aldiss’s short story “Who Can Replace a Man?” for its example of a human analogue of robot dialogue—and, come to think of it, for posing the question so precisely.