This study evaluated the extent to which 14 research skills were enhanced by science undergraduates' participation in an undergraduate research experience (URE). Fifty-seven undergraduates self-rated their ability to perform the skills at the beginning and end of the URE. Faculty mentors' ratings of their respective interns' skills served as an objective measure of intern skill level. Mentor and intern data revealed that the URE enhanced some skills better than others. At the end of the URE, female interns rated their ability to understand concepts in their field significantly lower than did male interns. Female interns also tended to perceive less of an increase in their ability to formulate research hypotheses than did male interns.(PsycINFO Database Record (c) 2016 APA, all rights reserved)