The intermittent presentation of food to a food deprived animal has been shown to result in the appearance of a class of behaviros collectively referred to as adjunctive behavior or schedule-induced behavior. Within the animal literature behaviors such as polydipsia, aggression, pica, excessive food consumption have been classified as schedule-induced. While schedule-induced behavior investigations have been extended to include the study of human subjects, the procedure and the way of data analysis in human studies have usually differed from those in animal studies. The schedule-induced studies in human are critically reviewed in this paper and following problems are pointed out. (1) Arbitrary definition of the operant behavior and the reinforcer in the human studies. (2) The lack of assessment for schedule performances. (3) The use of inappropriate control procedures to assess the baseline rate of behavior. (4) The relationship between the inter-reinforcement interval and the amount of schedule-induced behavior was not clear.