Above the sessions exist presbyteries, which have area responsibilities. These are composed of teaching elders and ruling elders from each of the constituent congregations. The presbytery sends representatives to a broader regional or national assembly, generally known as the General Assembly, although an intermediate level of a synod sometimes exists. This congregation / presbytery / synod / general assembly schema is based on the historical structure of the larger Presbyterian churches, such as the Church of Scotland or the Presbyterian Church (U.S.A.); some bodies, such as the Presbyterian Church in America and the Presbyterian Church in Ireland, skip one of the steps between congregation and General Assembly, and usually the step skipped is the Synod. The Church of Scotland has now abolished the Synod.[citation needed]