How many votes are required to limit debate?

In parliamentary procedures, particularly those following Robert's Rules of Order, limiting debate typically requires a two-thirds vote. This higher threshold is established to ensure that the decision to curtail discussion represents a significant consensus among members. This is important in democratic assemblies, as it prevents a minority from being silenced without the collective agreement of a substantial majority, thus maintaining the principles of fair debate and representation.

A simple majority, while sufficient for many decisions, does not provide the same level of consensus needed for actions like limiting debate, where differing opinions may still be strongly held. Unanimous consent would mean that all members agree, which is rarely practical in larger groups, and a three-quarters vote is even more stringent than the two-thirds requirement. Therefore, a two-thirds vote strikes an appropriate balance by allowing for a clear majority to move forward while still respecting minority opinions.