Restoring damaged or worn components to a useable state represents one of the biggest engineering challenges of interplanetary travel; where there is no chance of re-supply. As with reliability, the eventual repairability (in terms of feasibility and cost) of any part lies almost entirely in the design phase. In the case of terrestrial machines repairability is often a tertiary or lower design concern as acquisition cost and performance usually dominate the design protocol. Further, in military terms, more than one machine (submarine, aircraft carrier, or airplane) is always procured so that the minimum number needed for national security is always available. This 'luxury' is not an available option when considering human space flight. This presentation reviews some design requirement aspects for repair techniques, repair scenarios, and processes applicable to repair.