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Based on analysis and simulation with synthetic workloads, Eager, Lazowska and Zahorjan [ELZ88] claim that ``there are likely no conditions under which migration could yield major performance improvements beyond those offered by non-migratory load sharing...'''' [ELZ88]''s system model is intended to be conservative in the sense that it overestimates the benefits of migration of active processes and underestimates the benefits of non-migratory load-sharing. In this note we point out that there are, in fact, several ways in which the [ELZ88] analysis and workload model understate the benefits of migrating active processes. We also discuss their system model and its applicability to current systems. We conclude that the general result of [ELZ88] does not apply to current systems. Elsewhere ([HBD95]) we use a trace-driven simulation to show a wide range of conditions in which preemptive migration provides …