Background: To address the effectiveness and sustainability of school-based interventions, there is a need to consider factors affecting implementation success. This rapidly growing field of implementation focused research is struggling with how to assess and measure implementation-relevant constructs. Earlier research identifies the need for strong psychometric and pragmatic measures. The aims of this review are therefore to (i) systematically review the literature to identify measurements of

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... actors influencing implementation which have been developed or adapted in school settings, (ii) describe each measurement's psychometric and pragmatic properties, (iii) describe the alignment between each measurement and corresponding domain and/or construct of the Consolidated Framework for Implementation Research (CFIR).Methods: Six databases (Medline, ERIC, PsycInfo, Cinahl, Embase, and Web of Science) will be searched for peer-reviewed articles reporting on primary and secondary school settings, published from year 2000. Our search string will be built on three core levels of terms for: (a) implementation, (b) measurement, and (c) school settings. Two independent researchers will screen articles and extract data, with a third researcher cross-checking the process. The identified measurements will be mapped against CFIR domains and constructs, and analyzed for their psychometric and pragmatic properties using The Psychometric and Pragmatic Evidence Rating Scale (PAPERS), as well as for their measurement equivalence (invariance). The protocol follows the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols (PRISMA-P).Discussion: By identifying measurements that are psychometrically and pragmatically strong in the field, this review can contribute to the identification of feasible, effective, and sustainable implementations strategies. Through highlighting the gaps within the range of constructs in the tools retrieved, this review may provide insights for future research and where resources could be allocated. Combined, this review will provide a greater understanding of factors influencing implementation of initiatives within school settings, and how these can be further studied.Registration: This review is submitted to be prospectively registered on PROSPERO ID: 284741. Submission occurred the 12th of October 2021.