This article addresses differences between typical and maximum performance criteria and has a threefold purpose. First, it examines the growing recognition that it is important to distinguish between typical and maximum performance criteria. Second, clarification of definitional and measurement issues are addressed. Third, results of an empirical study are offered to contribute to the new knowledge base regarding typical and maximum performance criteria. The study investigates differences in validities of cognitive ability predictor measures against supermarket cashier typical and maximum performance criteria reflecting speed and accuracy White-Black mean score differences on typical and maximum performance criteria are also examined.