As our nation's need for engineering professionals grows, educators and industry leaders are increasingly becoming concerned with how to attract women to this traditionally male career path. Self-efficacy has been shown to be related to positive outcomes in studying and pursuing careers in non-traditional fields. This paper describes the results of two years of engineering self-efficacy data collected from women engineering students at five institutions across the U.S. This study adds to the growing body of self-efficacy literature via its multi-year, multi-institution design and helps to clarify the impact of the engineering curriculum on self-efficacy. Results indicate that while women students show positive progress on some self-efficacy and related subscales, they show a significant decrease on feelings of inclusion from the first to second measurement period and further suggest a relationship between ethnicity and feelings of inclusion. Additionally, correlations show that self-efficacy is related to women students' plans to persist in this predominantly male discipline. Sadker and Sadker, 1994). As our nation's need for engineering professionals grows, educators and industry leaders are focusing their efforts on attracting women to this traditionally male career (Chubin, May, and Babco, 2005). Although self-efficacy has been found to be an important factor in the success of women pursuing a non-traditional career choice such as engineering (Betz, 2001;Blaisdell, 2000;Lapan, Boggs, and Morrill, 1989;Marra, Schuurman, Moore, and Bogue, 2005; Nauta, Epperson, and Kahn, 2003), the exact nature of how the engineering curriculum impacts self-efficacy is unclear. Further, there is currently a lack of studies that track selfefficacy of individuals, as well as a lack of multi-institution studies that would increase generalizability. Given that different institutions likely offer differing levels and types of support, exploring the potential relationship between institution and engineering selfefficacy is an important piece in understanding student satisfaction, achievement, and ultimately, retention in engineering programs. This study begins to address these gaps in the literature.Self-efficacy refers to individuals' beliefs in their capabilities to plan and take the actions required to achieve a particular outcome (Bandura, 1986). Efficacy applies to any situation; it is particularly important in choosing and executing constructive actions in situations that can be barriers to successfully achieving the ultimately desired outcome. In engineering, such a barrier might be negative stereotypes, active discouragement by peers or faculty, or scoring poorly on a calculus exam.This study of self-efficacy is situated in the framework of understanding the constructs that impact the success of women studying engineering. We recognize that other frameworks exist for studying this phenomenon (e.g., career perceptions or skills development); however, we chose self-efficacy for several reasons. Self-efficacy is a concep...