This poster showcases how Univeristy of Maryland Libraries' Special Collections and University Archives analyzed and re-purposed collection assessment data gathered from 2013 to use as the basis for a new, data-driven workflow for establishing processing priorities, addressing a backlog of 'hidden' collections, and overhauling the processing guidelines across several curatorial units. The poster demonstrates how commonly collected assessment data can be leveraged to revamp outdated processes, and highlights the impact (and limitations) of assessment within special collections.