The authors examined the effect of inserting observation practice and undir
ected dialog into the rest interval between practice trials on the learning
of a complex task (stabilometer). Training protocols in which learners pra
ctice in pairs (dyads) result in increases in learning efficiency, but the
critical issue is the effect on learning effectiveness. Three groups of par
ticipants (n = 12 in each group) practiced maintaining their balance on a s
tabilometer. One group practiced individually, and the other 2 groups pract
iced in dyads in which 1 performer practiced the task while the other obser
ved. in the dyad-alternate condition, participants alternated between physi
cal, observational, and dialog practice on each trial, whereas in the dyad-
control condition, subjects completed all trials on 1 form of practice (eit
her physical or observational practice) before engaging in the other form.
The results indicated that the dyad-alternate group initially performed mor
e poorly bur quickly overtook the individual group, and the performance adv
antage of the dyed-alternate group was maintained on the delayed retention
test. When the different forms of practice were performed consecutively, as
in the dyad-control group, acquisition and retention performance was gener
ally poorer than when they were alternated. Those results suggest that one
can combine the benefits of physical practice, observation, and dialog betw
een learners in an interactive way to produce an effective and efficient le
arning protocol.