This research provides the first review of publicly available assessment information found on Association of Research Libraries (ARL) members' websites. After providing an overarching review of benchmarking assessment data, and of professionally recommended assessment models, this paper examines if libraries contextualized their assessment activities for planning internal program improvements. Benchmarking data included LibQUAL + [R] and SAILS. Professionally recommended assessment models included Return on Investment and the value-added framework. This research analyzes ARL members' annual reports, websites, and strategic plans to evaluate whether or not libraries used benchmarking assessment and endorsed assessment models to describe their value to the parent institution. The results of this research reveal inconsistencies among ARL members' reporting of assessment. The researchers offer examples of exemplary assessment reporting by three ARL members. (Contains 4 charts, 3 figures and 5 tables.)