Abstract
Which dimensions of instruction can be reliably captured using student perception surveys, is subject for debate. The aim of this study is to empirically explore the validity and limitations of two different measures of cognitive activation: systematic classroom observations and student perceptions. 34 video-recorded lessons from ten lower secondary mathematics teachers in Iceland were analysed using an observation system and compared to 217 responses to the Tripod student perception survey. The results indicate that for the cognitive activation dimension, the connection between observer ratings and student perceptions is weak, raising questions about the validity of different measures of instructional quality.
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