Nationwide K–6 engineering and coding standards have made it increasingly important to prepare elementary preservice teachers (PSTs) to teach these subjects confidently and effectively. Robotics, which combines coding and engineering, provides a rich context for developing PSTs’ expertise and self-efficacy. This study builds on prior work in which PSTs in an instructional technology course collaborated with undergraduate engineering students to co-teach robotics lessons to fifth graders. Using a multiple-embedded case study approach, we examine how the interactions and teaching roles within these partnerships influenced PSTs’ teaching self-efficacy. Drawing on reflections, lesson recordings, surveys, and interviews, we present the cases of three PSTs—Lisa, Madison, and Kayla—who experienced varying levels of partner support and student engagement. Lisa and Madison were both compelled to lead robotics instruction due to perceived lack of support from their engineering partners, yet they experienced contrasting outcomes: Lisa struggled with disengaged students and malfunctioning robots, which diminished her self-efficacy, while Madison's success with highly engaged students bolstered hers. Kayla, in contrast, developed self-efficacy over time through a productive partnership with a supportive engineering student. These cases highlight the complex relationship between partner dynamics, teaching roles, perceived success, and self-efficacy development. Implications for supporting PSTs in engineering-integrated experiences are discussed.
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