Intended to provide guidance to Extension specialists and agents faced with requests for impact analyses from communities experiencing economic development, this report also summarizes issues that need to be considered. The first section, on private sector impacts, addresses questions on predicting changes in production, employment, and housing resulting from proposed developments. A second section discusses public sector impacts and highlights methods for estimating changes in public expenditures (using school expenditures as an example) and public revenues resulting from economic development events. In the third section, the economic base and input-output models are covered, with a review of the basic data needs and assumptions of the models, which describe links (jobs, income, and output) between a development event and the rest of the community. Some other important changes which may occur in a community but are not easily estimated with economic models are reviewed in the fourth section, on nonmarket impacts (population changes, employment-related changes, and changes in political atmosphere). The final section defines Extension's role in impact analysis; reviews differences between facts, values, and beliefs; identifies points in the decision-making process where Extension education programs are most appropriate; and outlines various approaches to deliver impact analyses. (MH)