In establishing cost data under Sec. Sec. 436.16 and 436.17 and measuring cost effectiveness by the modes of analysis described by Sec. 436.19 through Sec. 436.22, a format for accomplishing the analysis which includes all required input data and assumptions shall be used. Subject to Sec. 436.18(b), Federal agencies are encouraged to use worksheets or computer software referenced in the Life Cycle Cost Manual for the Federal Energy Management Program.