This session will explore user-centered tools and methodologies used by UC Santa Cruz during our recent Primo implementation. I will discuss the creation of user personas using focus group findings, review of relevant literature, and the experiences of subject matter experts. I will explain how these personas were used when making early implementation decisions. After implementation of our Primo instance, UCSC executed a robust user testing program in which we tested 6 faculty members, 5 undergraduate students, and 1 graduate student. I will discuss the creation of our usability research questions and how these questions were formulated into actionable user tasks for testing or post-test interview questions. I will also discuss our process for analyzing our test data and making recommendations for improvements within our Primo system. Our plans for future testing, including student mediated “guerrilla testing” will also be presented. Slides with notes: bit.ly/JWUCDLFx2019