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Research has shown that teachers\u2019 self-efficacy can be as influential as their actual level of knowledge and abilities. However, there has been very limited research on CS teachers\u2019 self-efficacy. This study describes the development and implementation of an instrument that measures secondary school teachers\u2019 self-efficacy in teaching computer science. Teachers attended a nine-week hybrid professional development program and completed the computer science teaching self-efficacy instrument. Confirmatory factor analysis validated the self-efficacy instrument, which can be potentially used in other CS education settings. The results also indicated that teachers\u2019 self-efficacy in the content knowledge and pedagogical content knowledge dimensions of teaching computer science significantly increased from participating in the professional development program.<\/jats:p>","DOI":"10.1145\/3410631","type":"journal-article","created":{"date-parts":[[2020,9,1]],"date-time":"2020-09-01T10:11:27Z","timestamp":1598955087000},"page":"1-18","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":33,"title":["High School Teachers\u2019 Self-efficacy in Teaching Computer Science"],"prefix":"10.1145","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2429-3664","authenticated-orcid":false,"given":"Ninger","family":"Zhou","sequence":"first","affiliation":[{"name":"School of Education, University of California, Irvine, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ha","family":"Nguyen","sequence":"additional","affiliation":[{"name":"School of Education, University of California, Irvine, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christian","family":"Fischer","sequence":"additional","affiliation":[{"name":"Hector Research Institute of Education Sciences and Psychology, University of T\u00fcbingen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Debra","family":"Richardson","sequence":"additional","affiliation":[{"name":"Donald Bren School of Information and Computer Sciences, University of California, Irvine, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"Warschauer","sequence":"additional","affiliation":[{"name":"School of Education, University of California, Irvine, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2020,9]]},"reference":[{"key":"e_1_2_1_2_1","volume-title":"Participation in Computing","author":"Aspray William","unstructured":"William Aspray . 2016. 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