We have investigated how open attitudes, attribution beliefs, pedagogical knowledge, and pedagogical content knowledge were related to teaching performance among teacher interns. The participants were 72 teacher interns in Hong Kong, where large-scale education reform has been launched since 2000. Multiple methods (self-report, academic grades, and ratings from mentors and supervisors) were used to measure the interns' attribution beliefs, open attitudes, pedagogical knowledge, pedagogical content knowledge, and teaching performance. It was found that their openness to advice and challenges, effort attribution for failure, and pedagogical content knowledge were positively associated with their teaching performance in an era of education reform. (Contains 2 tables.)