Term -I&S

The Department of Defense’s overall goal of Interchangeability and Substitutability (I&S) is to eliminate duplication in the management and logistics support of interchangeable and substitutable items.
INTERCHANGEABLE – An item with functional and physical characteristics equal in performance, reliability & maintainability to a similar item, without alteration, except for adjustment.
SUBSTITUTABLE – An item with functional and physical characteristics capable of being exchanged for another item only under specified conditions or for particular applications (without alteration!).

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