Like Freud himself, most advocates of his theory regard the analyst's many observations of the patient's interactions in the treatment sessions as the source of findings that are unmatched, not only heuristically but also probatively. We are told that during a typical analysis, which lasts for some years, the analyst accumulates a vast quantity of variegated data from the patient and that these data are evidentially relevant to Freud's theory of personality, no less than to the dynamics