38 The reliability and construct validity of student perceptions of teaching quality be interesting to investigate whether the Impact! tool scores for teaching quality in combination with other teaching quality measures provide the best picture of teaching quality. The present study provides valuable information about the construct validity and reliability of the Impact! tool for measuring student perceptions of teaching quality. Because the questionnaire needed to be short (for teachers as well as for students), several characteristics of effective teaching were measured globally. Therefore, one may argue that Impact! has its greatest value as a quick scan that provides a f irst, global impression of the quality of teachers’ teaching. It would be excellent if additional questionnaires could be developed and added to the Impact! tool that will enable teachers to obtain more detailed information on one or more specif ic characteristics of effective teaching; for example, if a teacher does not score high on the classroom management or clear instruction items of the Impact! tool. The development of such in-depth questionnaires is an interesting topic for future research.
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