Collective efficacy is the belief that a group of teachers can have a strong impact on student learning. According to Hattie’s meta-analysis, collective efficacy has an effect size of 1.57 which is nearly 4 times the .4 average effect size for one year. In this post, I would like to describe one way in which effective Professional Learning Communities (PLCs) can feel more efficacy as a group: the Collective Teacher Inquiry.

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