The ability to optimize high-level logistics management decisions depends on clearly defined top criteria which comprehensively reflect the end effect. The existence of a link between top criterion (such as DR) and spares quantities allocation, provides management with an effective view of the impact on the logistics system from a top-down aspect. This approach preserves the main principle that the management level (making the decisions) must define top level requirements only rather than having to go into details at lower levels. The objective of this present research was to link spares allocation to definition of Availability and DR as top criteria with the aid of convenient and clear logistics parameters.