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This study examines the development and sources of self-efficacy among middle school teachers implementing the ****** engineering curriculum. Drawing on Bandura’s (1997) social cognitive theory, the study uses survey data from 16 teachers and semi-structured interviews conducted over one to three years of participation. Descriptive analyses of self-efficacy scores (TESS and curriculum-specific measures) revealed generally high and stable or increasing confidence in teaching engineering. Qualitative findings showed that mastery experiences overwhelmingly influenced teachers’ self-efficacy, with minimal reference to other sources. These results suggest that sustained curriculum implementation can support teacher self-efficacy and highlight the importance of designing professional learning experiences that foster mastery experiences along with providing access to other sources of self-efficacy.