19 2 2 The reliability and construct validity of student perceptions of teaching quality Abstract Student perceptions of teaching quality can be collected efficiently by means of the Impact! tool, which allows students to provide feedback to teachers regarding a lesson. However, the reliability and validity of student perceptions of teaching quality are a subject of scientific debate. In this study, data from 26 teachers and their students were therefore analysed to assess the construct validity of the Impact! questionnaire, using a combined item response theory and generalizability theory model. Moreover, the global and local reliability of the scores were investigated. Results supported the construct validity of the questionnaire. The student Impact! scores were also found to be reliable measures of teaching quality. Based on: Bijlsma, H. J. E., Glas, C. A. W., & Visscher, A. J. (under review). The reliability and construct validity of student perceptions of teaching quality. Educational Assessment, Evaluation and Accountability.
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