Suppose that X 1, X 2, ... is a sequence of absolutely continuous or integer valued random variables with corresponding probability density functions f n (x). Let {φ n } n=1 ∞ be a sequence of real numbers, then necessary and sufficient conditions are given for n -1 log f n (φ n )-n -1 log P (X n >φ n )=0(1) as n→∞. © 1979 Kluwer Academic Publishers.