These materials, prepared for the U. S. Environmental Protection Agency Technology Transfer Program, were used in presenting Technology Transfer design seminars throughout the United States. When faced with decisions on wastewater treatment system upgrading or replacement, many small communities and rural areas run into financial difficulties. This trio of documents presents the results of research into this problem, which examines various strategies and systems, and their associated costs, in order to arm utilities managers in such communities with information vital to making informed, responsible decisions regarding wastewater treatment.