The LeaderShape Institute is a popular immersion-based leadership program that is hosted on dozens of university campuses and conducted nationally each year. As part of a comprehensive research effort, a sample of 1,279 students at 21 participating institutions completed a pre-test prior to participating, as well as a post-test immediately after and a followup test three to four months later. Tests included measures of leadership skills, leadership-oriented self-efficacy, motivation to lead, and motivation to advocate for social issues. Results suggest students make gains in skill, confidence, and motivation to advocate for social issues, but that not all gains emerged similarly across social identity groups. Several differences emerged when comparing gains measured from pre-test to post-test and gains that included follow-up tests. This study provides support for the effectiveness of the LeaderShape Institute, and possesses several implications for the methods used in assessing the development of leadership capacity.