Joint Ministerial Committee. An inter-governmental committee consisting of UK Government, Scottish, Welsh and Northern Ireland Ministers. The JMC was established to allow the devolved administrations to be involved in the UK Government's deliberations when it is considering issues where reserved and devolved responsibilities overlap, and vice versa. The terms of reference for the JMC are set out in an annex to the Memorandum of Understanding agreed between the UK Government and the devolved administrations in Scotland, Wales and Northern Ireland and first published on 1 October 1999.