Libraries must mitigate chronic funding issues through fundraising. At the same time support from stakeholders has become more important, requiring more-effective friendraising. These needs led the Association of Research Libraries to award an ARL SPEC Kit on Library Development to document support (personnel, funding and other resources) for library development, and the work methods, efforts and assessment types for development at major libraries. The national data collection and analysis will culminate in an ARL-published Open Access monograph, and an ARL-hosted webinar. The unique data set and findings support leaders in benchmarking fundraising and friendraising capacity, and in assessing library development.