This instructor's manual describes each section of a 3-day technical seminar on how to measure the economic impact of alternative designs, systems, and operation and maintenance strategies in federal buildings. The manual was prepared to help instructors of the General Services Administration conduct technically sound and comprehensive seminars. For each technical session, the manual provides an introduction explaining the purpose of that session followed by copies of each visual and an outline of the commentary that would accompany that visual. The seminar covers the fundamentals of lifecycle cost, benefit-to-cost ratio, savings-to-investment ratio, internal rate of return, and payback analyses; sensitivity and probability analyses; break-even analysis; replacement decisions; and the solution of sample building problems that illustrate these economic evaluation methods. The sessions alternate between presentations of economic theory required for evaluating problems and actual problems that illustrate the economic evaluations in practice. Real building design problems with an emphasis on energy conservation are presented for individual and group solutions. The manual describes step by step how to present the problems and how to solve them. It presupposes an existing familiarity of the instructors with the basic concepts and evaluation techniques used in the seminars. (The appendixes contain a sample 3-day agenda and a selective bibliography of 13 citations that describe in detail the economic methods presented.) (Author)