A historically rich teaching intervention was developed for biological
evolution with the intent of promoting a conceptual change from stude
nts' initial understanding to a more Darwinian understanding. The inte
rvention was delivered in a small group setting to underprepared, entr
y-level biology students. Evaluation of the treatment, using pre-post
testing, was used to document the general effectiveness of the interve
ntion and specific changes in students' conceptions of evolution. Resu
lts indicate the use of historical materials in conjunction with a con
ceptual change strategy to be promising. Specific strengths and weakne
sses in specific areas of biological evolution are documented. (C) 199
5 John Wiley & Sons, Inc.