Van der Linden and Veldkamp (2004,2007) proposed an entirely different approach. They developed an exposure control method that did not need any simulations, but that was based on observed exposure rates instead. In their item eligibility method, a probability experiment is carried out for every item in the bank with exposure rate higher than the maximum exposure rate imposed. In this probability experiment it is determined whether the item is eligible for administration, that is, whether it is included in the sub item bank from which the subsequent item is selected or not. The probability of being eligible depends on the ratio of the observed exposure rate and the maximum exposure rate.