574 THE EXPECTED ADVANTAGE OF ASYNCHRONY R. Cole, O. Zajicek, September 1991 This paper studies the implicit costs of synchronization and the advantage that may be gained by avoiding synchronization in asynchronous environments. An asynchronous generalization of the PRAM model called the APRAM model is used and appropriate complexity measures are defined. The advantage asynchrony provides is illustrated by analyzing two algorithms: a parallel summation algorithm which proceeds along an implicit complete binary tree and a recursive doubling algorithm which proceeds along a linked list.