This session will describe the process and results of an instruction team’s pilot project to analyze student writing portfolios using ACRL standards. Following the English Department’s existing portfolio review methods, the team assessed portfolio samples from a class that received library instruction, as well as a second batch of samples from a class that did not. The team identified four specific learning outcomes, which were measured with a rubric. Outcome results indicated differences as well as similarities between the samples. This pilot helped refine the assessment process and it offered possibilities for changing the content of future library instruction sessions.