Shared Curricular Authority in School Education: Updated Protocol and Frozen Search Strategies for a Systematic Review of Curriculum Co-Construction in K–12 Settings

This registration updates and extends the previous protocol registration (10.17605/OSF.IO/GSVZH) and materials package (10.17605/OSF.IO/9BJNA). It documents the focused operational definition of substantive curriculum co-construction, the frozen development, sentinel, validation, and negative-control sets, and the exact prospective search strategies for Scopus, Web of Science Core Collection, and ERIC. The protocol addendum and exact search strategies were jointly ratified by the two human reviewers, Edgar Enrique Castaño González and Jaime Eduardo Jimenez Sarmiento, on 1 August 2026. At the time of this registration, no formal database searches had been executed and no PRISMA counts had been generated from these strategies. Pilot counts are retained solely as strategy-development and recovery-verification evidence and will not be incorporated into the formal PRISMA flow diagram. Formal searches will be conducted only after this registration is submitted and time-stamped. The registered files include the ratified protocol addendum, exact search strategies, technical control workbook, database-specific development audits, loading instructions, and the SHA-256 integrity manifest.