Simulators have emerged as important components of flight-training pro
grams. Nevertheless, the development of design principles that can max
imize training transfer and cost-benefit trade-offs are not well estab
lished. The most significant challenge to research that would bear on
simulator design principles is the difficulty and expense of flight tr
ansfer experiments. This difficulty and expense can be reduced by the
use of an in-simulator transfer design, designated here as a quasi-tra
nsfer study, in which transfer is to a high-fidelity configuration of
a simulator. Of primary concern for such studies is whether the implie
d assumption of correspondence between quasi-transfer and transfer eff
ects is well founded. In this article, we review evidence that bears o
n this issue. The evidence is not entirely supportive but does indicat
e some correspondence between quasi-transfer and transfer.