The advent of `intelligent' computers has given several new twists to the tangle of problems which constitute the Philosophy of Mind. Some writers have proposed that computation can provide us with a new explanation of the nature of the mind. It is not difficult to see why. It has become commonplace to use mental terms about computational processes. At many points in this book we have talked of understanding, decision, searching, and other cognitive processes in relation to computer programs we have described or referred to. Can such cognitive or intellectual ascriptions be taken literally? Or are we simply indulging in poetic (or philosophic) licence?