Although outstanding creativity has been viewed as an acquired expertise, c
reative development might operate differently than occurs in sports, games,
and music performance. To test the creative-expertise hypothesis, the care
ers of 59 classical composers were examined according to the differential a
esthetic success of their 911 operas. The potential predictors were seven m
easures of domain-relevant experience: cumulative years (since first operas
, first compositions, and first lessons) and cumulative products (genre-spe
cific operas, all operas, all vocal compositions, and all compositions). Th
e nonmonotonic longitudinal trends and the relative explanatory power of th
e expertise-acquisition measures indicate that complex specialization ("ove
rtraining") and versatility ("cross-training") effects may determine creati
ve development across the life span. The broader implications of the findin
gs are then discussed. (C) 2000 Academic Press.