AYLLON AND AZRIN = studied 45 female patients with sz who received tokens for good behaviours e.g making their beds or had tokens taken away for psychotic beh. = found that before the introduction of TE, they showed aggression and poor social skills but following the us of TE, there was a massive improvement in such beh. = it can be used to help manage sz beh in institutions. (-) we cannot generalise; only females