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Interim Approval to Operate

Abbreviation(s) and Synonym(s):



  Temporary authorization granted by principal accrediting authority (PAA) or authorizing official (AO) for an information system to process information based on preliminary results of a security evaluation of the system. (To be replaced by ATO and plan of action and milestones (POA&M)) Rationale: Term has been replaced by the term “authorization to operate (ATO)” with conditions.
CNSSI 4009-2015 under interim approval to operate (IATO)