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The Slide-Rule Life Cycle Cost Model System (SRS) has been designed as an aid to system, subsystem ad assembly designers in making cost estimates and trade-offs early in the design process. At this stage it is still posible for cost analysis to influence design - system cost has not yet been 'locked in' due to the lack of flexibility in system configuration which occures in the later phases of design. The SRS consists of four linked programs implemented on a Texas Instruments TI-59 programmable calculator coupled to a TI PC-100A printer. Each program is appropriate to a different design phase and aggregation level. The first estimates the life cycle costs of a system by making simplifying assumptions about its subelements; the second is used for the design of a single Lowest Removable Asembly (LRA); the third estimates system or subsystem costs by aggregating the costs of its subelements, computed in the second program; the fourth is a specialized program used to compute the achieved system confidence level against a stock-out of spare parts.