A unanimous consent request setting terms for the consideration of a specified bill or other measure. These agreements are usually proposed by the Majority Leader or floor manager of the measure, and reflect negotiations among Senators interested in the measure. Many are "time agreements," which limit the time available for debate and specify who will control that time. Many also permit only a list of specified amendments, or require amendments to be to the measure. Many also contain other provisions, such as empowering the Majority Leader to call up the measure at will or specifying when consideration will begin or end.