The purpose of this study was to examine students' psychosocial perceptions of their science classroom learning environment in order to identify exemplary teachers. This mixed-method study used the valid and reliable What Is Happening In this Class? (WIHIC) questionnaire with over 3,000 middle school students in 150 classrooms in Australia. Exemplary teachers were defined as those whose students' perceptions were more than one standard deviation above the mean for three of the five scales of Student Cohesiveness, Teacher Support, Involvement, Task Orientation and Equity. The reliability of the WIHIC scales ranged from 0.75 to 0.87. Eta[superscript 2] showed that the WIHIC was able to distinguish between the perceptions of the students in the classroom. The construct validity of the WIHIC for identifying these exemplary teachers was confirmed through interviews with students and these views are reported in the article.