Until 1870, two scholars noted, unanimous approval agreements were «used with some frequency.» These early-unanimous approval agreements are «like today`s term limitation agreements that provide for the transfer of a measure to a specific date.» 5 An exchange, on 24 April 1879, illustrates the practical application of these agreements to limit debate and set the time for a vote. The exchange is a reminder of what is happening in today`s Senate. If an item is before the Assembly to act, z.B a dissolution, it is the right of each member to have it read once.  Another case of this requirement is the reading of the minutes. Unanimous approval is required not to be read. Any member can demand that the minutes be read and it should be done.  With respect to ambiguity, there were two main issues. First, could these agreements be amended or amended by a new agreement unanimously? Second, could the presiding official enforce these agreements? Today, both principles are accepted as procedurally «given.» Not like that a few decades ago. Thus, on March 3, 1897, Senator George Hoar, R-MA, declared, «I think it is very serious to set a precedent in all circumstances to revoke unanimous approval by other unanimous approval agreements.» 10 One of the institutional leaders of the Senate, Henry Cabot Lodge, R-MA. also argued that «if the unanimous approval agreements are to be amended, we will soon not agree unanimously. I think nothing is more important than the rigidity with which the Senate maintains the approval agreements unanimously. 11 Or, as Senator Joseph O`Gorman, D-NY, stated: «Have they not established that a unanimous approval agreement cannot be affected or amended by another unanimous approval agreement, nor by a Senate ordinance? 12 Certainly, other senators have argued that these pacts could be changed by unanimous new approval.
Unanimous approval can be used as part of a consensus decision. In this process, unanimous approval does not necessarily imply unanimous agreement (see consensus decision agreement against approval). In Westminster parliaments, leaving the house or leaving the Senate is a concept similar to that of unanimous approval. If a member asks for leave to do something different from the rules, a single objection may prevail.   In the corresponding part (section 4) of the Rule of The Senate XII, it states: «No unanimous request for approval of a senator for the final vote at any given time after the adoption of a common law or resolution is subject to the approval of the Senate, until a decision ordered by the Speaker to that effect is taken. And so, if a unanimous agreement is given, the Senate will be the same as the Senate, but any unanimous agreement can be revoked by another unanimous agreement, which is given in the manner prescribed above for one day. Given their importance to the chamber`s activities, it is worth understanding the context or origin of the unanimous approval agreements. The purpose of this report is to determine how and why these informal agreements became special orders of the Senate that became enforceable by the presiding official. This report is updated if circumstances warrant. For more information on unanimous approval agreements, see IRS Report 98-225, unanimously agreed in the Senate, by Walter J. Oleszek; CRS Report RS20594, How Unanimous Consent Agreements Regulate Senate Floor Action, by Richard S.
Beth; and CRS Report 98-310, Senate Unanimous Consent Agreements: Potential Effects on the Amendment Process, by Valerie Heitshusen.