Asset-based community development (ABCD) is a methodology for the sustainable development of communities based on their strengths and potentials. It involves assessing the resources, skills, and experience available in a community; organizing the community around issues that move its members into action; and then determining and taking appropriate action.[page needed] This method uses the community's own assets and resources as the basis for development; it empowers the people of the community by encouraging them to utilize what they already possess. The ABCD approach was developed by John L. McKnight and John P. Kretzmann at the Institute for Policy Research at Northwestern University in Evanston, Illinois. They co-authored a book in 1993, Building Communities from the Inside Out: A Path Toward Finding and Mobilizing A Community’s Assets, which outlined their asset-based approach to community development. The Community Development Program at Northwestern University’s Institute for Policy Research established the Asset-Based Community Development Institute based on three decades of research and community work by John P. Kretzmann and John L. McKnight.