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Sims, S., Fletcher-Wood, H., O’Mara-Eves, A., Cottingham, S., Stansfield, C., Van Herwegen, J., Anders, J. (2021). What are the Characteristics of Teacher Professional Development that Increase Pupil Achievement? A systematic review and meta-analysis. London: Education Endowment Foundation. Accessed from: https://educationendowmentfoundation.org.uk/education-evidence/evidence-reviews/teacherprofessional-development-characteristics/