Purpose - The purpose of this paper is to report an academic library's efforts to introduce course-integrated assessment into its library instruction program. Applying a leadership change model to the process allows for a step-by-step examination of both organizational change and the creation of cultures of assessment. Design/methodology/approach - Over a period of three years, course-integrated assessment was introduced into an academic library's instruction program. Rather than implementing rapid, superficial change, the process focused on transforming librarians' thoughts and feelings about their teaching and student learning. Dr John P. Kotter's eight-step process for leading organizational change is applied to explain the methodology. Findings - Kotter's leadership change model provides a suitable framework for organizing and implementing organizational change within an academic library. However, the use of his method to create and sustain cultures of assessment proves questionable. This may not be fault of his method, but a combination of a less than perfect application of his process and unrealistic expectations of how cultures of assessment develop and function. Research limitations/implications - The paper focuses on one unit within an academic library, rather than an academic library as a whole. Practical implications - Changing organizational culture, creating cultures of assessment, and/or implementing course-integrated assessment exemplify some of the challenging tasks academic libraries face in their mission to prove value. This case study provides a candid discussion of both successes and obstacles encountered in using a change leadership model to address each of these. It may also inspire other possible uses of such a model within academic libraries. Originality/value - According to Meredith Farkas, investigations into the application of leadership change models to build and sustain cultures of assessment within academic libraries do not exist in the literature.