In 2012 Cornell University Library (CUL) created two assessment tools, drawing heavily on work published in the United Kingdom. These tools are meant to be used to evaluate partnerships at multiple points in their life cycle, from potential partnership to sunset. The Pre-Partnership Check-up is for those considering whether to engage in a partnership. It is intended to guide the thinking of CUL partnership leads as they assess the value, costs, and risks of a new potential partnership. The Existing Partnership Check-up is intended to help partnership leads determine whether an existing partnership is functioning as well as it could be. The document “Partnership assessment tools: procedures” offers more detailed guidance on the use of these tools.