Consensus

Consensus by definition means unanimous agreement, or absence of any dissent. For example, if all 100 senators vote for a certain bill, it could be said that the bill was supported by a consensus. Consensus is always 100% agreement.

The only major organization in the world to operated on consensus is the North Atlantic Treaty Organization (NATO). Every decision that NATO makes must be either agreed on by all of its members or at least not opposed by any of its members in order for the prepositional to be passed. Most other organizations or decision making bodies such as the United Nations or the United States Congress are based on an agreed to percentage number to pass legislation.

The Polish legislature or "Sejm" in the 17th and 18th centuries operated by consensus. Foreign governments bribed members to vote no, and the result was a very weak state that was carved up by its neighbors.

Quaker meetings operate by consensus. Benedictine Monks use consensus decision making whenever large decisions need to be made.