Cool Stars 14 - Submitted Abstract # 204 This version created on 05 October 2006 M-Dwarf Stellar Models Brian Chaboyer, Dartmouth College Aaron Dotter, Dartmouth College Observations of the radii and masses of M-dwarfs which are detached eclipsing binary stars indicate that stellar evolution models predict radii which are 10% smaller than observed. This suggests that the stellar evolution models of M-dwarfs predict effective temperatures which are too hot. Recent deep HST ACS observations of globular clusters reveal that M-dwarf stellar evolution models are redder than observed. This suggests that the predicted M-dwarf effective temperatures are too cool. Possible solutions to these problems will be discussed. ----------------------------------