Here are some outstanding standardized assessment tools for measuring outcomes and value in your library.
Benchmark - For more information, visit https://www.ala.org/acrl/proftools/benchmark
HEDS Research Practices - For more information, visit https://www.hedsconsortium.org/heds-research-practices-survey/
LibQual - For more information, visit https://www.libqual.org/home
Project Outcome - For more information, visit https://acrl.projectoutcome.org/
Project SAILS - For more information, visit https://www.projectsails.org/site/
Threshold Achievement (TATIL) - For more information, visit https://thresholdachievement.com/