ABSTRACT Background STEM identity, a disciplinary identity that reflects an individual’s self-understanding in connection with science, technology, engineering, and mathematics (STEM), impacts students’ integration, retention, and success within STEM fields. Purpose This study aimed to develop a STEM identity instrument via structural equation modeling, the BioCheM-ID, to measure STEM identity across biology, chemistry, and mathematics among undergraduates enrolled in an introductory-level biology course. Design and methods As the first model in the literature to measure STEM identity across these three domains, the BioCheM-ID comprised five latent factors: biology perceived competence and interest, chemistry perceived competence and interest, mathematics perceived competence and interest, biology and chemistry beliefs, and mathematics beliefs. Content validity, internal structure validity, and internal consistency of data generated via the BioCheM-ID were investigated. A series of hierarchical multiple regression analyses was conducted to explore how student-centered factors, such as gender, race/ethnicity, major of study, and pre-college informal STEM learning experiences influence undergraduate STEM identity. Results Students’ major and participation in pre-college informal STEM learning experiences emerged as significant predictors of STEM identity, where STEM majors and students with mentoring and tutoring experiences reported a significantly higher STEM identity compared to their counterparts. The relationships between students’ educational aspirations, expectations, and STEM identity were explored, and positive correlations were observed. Students reported aspiring and expecting at least to earn a master’s or doctoral degree on average, highlighting the higher educational aspirations and expectations of the freshman students. Conclusions This study contributes to ongoing discussions on how to effectively support student populations in STEM, advocating for increased opportunities for early and meaningful STEM engagements.
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