The one-shot library instruction session has long been a mainstay for many information literacy programs. Identifying realistic learning goals, integrating active learning techniques, and conducting meaningful assessment for a single lesson all present challenges. Librarians and English faculty at one college campus confronted these challenges by participating in a year-long lesson study, a process of collaboratively planning, observing, and assessing a single lesson. By collectively identifying goals and priorities, designing and redesigning the lesson, and assessing outcomes through observation, surveys, and focus groups, librarians and teaching faculty negotiated varying expectations and demands for providing one-shot library instruction.he one-shot library instruction session is a routine occurrence at many academic libraries. Librarians strive to teach some basic research skills with the awareness that the one-shot instruction session is not ideal for meaningful retention or transfer of this knowledge to students' actual research experiences. These one-time, librarian-led presentations, which are developed to meet the needs of the first-year composition or other introductory-level course, are expected to both acquaint students with library services and teach them "how to research," including everything from searching the library catalog to using various databases to discerning types and quality of sources. Not surprisingly, such instruction sessions can easily overwhelm students with their jam-packed, whirlwind dispersal of information, and they can frustrate and overburden the librarians tasked with teaching them. Additionally, such instruction sessions are often unable to incorporate active crl12-255