This study examined how the level of desire to acquire an ability and
the perceived probability that it may be acquired affect self-assessme
nt of the ability. From three categories, (1) desire to acquire Is str
ong and desired level of acquisition is high, (2) desire is strong and
desired level of acquisition is average, and (3) desire is weak, ten
abilities each were chosen by each of 77 undergraduates. They also ind
icated the perceived probability that each ability might be acquired.
Then, self-assessment behavior for each ability was measured with the
choice and preference among four tasks that differed in terms of abili
ty diagnosticity. The main results were as follows. (a) High-diagnosti
c tasks were chosen more often than the others, regardless of the desi
re to acquire and the probability. (b) Preference For high-diagnostic
tasks was stronger when the desired acquisition level was high or aver
age and the perceived probability was high. (c) Subjects' reason for s
elf-assessment was their need to acquire accurate self-knowledge. The
results suggest that expectation of future self-enhancement affects th
e likelihood of self-assessment behavior.