Protocol-driven reviews that convert mixed-quality literatures into decision-ready briefs. Searches and selection steps are documented (PRISMA/PRISMA-S); study quality is profiled with RoB 2 and ROBINS-I; confidence is graded with GRADE where appropriate. Figures make effect direction and magnitude plain, and archived strategies with a managed citation library support audit and reuse. Options and trade-offs are stated clearly for leadership decisions.