Information technology (IT) and National Security Systems (NSS) with significant interoperability deficiencies (as determined by the offices of the Under Secretary of Defense for Acquisition, Technology and Logistics (USD(AT&L)), the Chief Information Officer of DoD, the Chairman of the Joints Chiefs of Staff (CJCS), and Commander, U.S. Joint Forces Command (JFCOM)) are placed on the IWL to ensure that sufficient attention is given to achieving and maintaining interoperability objectives, and to provide DoD oversight for those IT and NSS activities for which interoperability is deemed critical to mission effectiveness, but interoperability issues are not being adequately addressed. IT and NSS considered for the IWL may be pre-acquisition programs, acquisition programs (any Acquisition Category (ACAT)), already-fielded systems, or combatant commander-unique procurements.