Wikipedia:Attempting to overturn recent consensus
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As Wikipedia:Consensus notes: "proposing to change a recent consensus can be disruptive".
Generally
Sometimes, a proposal is repeatedly made, each instance of the proposal differing only in non-essential detail, without success. An article may be repeatedly nominated for deletion, renaming, or merging, each time seeing the proposal fail to achieve consensus, and the original article persists essentially unchanged. A policy may be proposed to be altered, but repeatedly discussions fail to find a consensus to move from the status quo.
The initiation of a new discussion a relatively short time after the closure of a previous discussion on the same topic is problematic. What constitutes "a short time after" may vary depending on the circumstances. A discussion yielding a solid consensus for an outcome should be given a wider berth than a discussion yielding a narrow consensus or resulting in an absence of consensus. A discussion of greater impact to the encyclopedia, such as whether to change a policy affecting a large number of articles, should be given a wider berth than a discussion about whether to keep or delete a specific article, or whether to include or remove a particular paragraph or assertion from a specific article. This applies where the new discussion seeking effectively the same outcome is raised in a different forum; an attempt to revisit the outcome of a specific discussion through a change of forum after a brief passage of time may merely be forum shopping.
Initiating a new discussion within a certain period of time after the closure of the most recent discussion addressing an issue may be perceived as beating a dead horse, and the better course of action may be to let it be.
Moratoria
A moratorium is a general restriction on editors proposing a specific change that has previously been proposed and rejected by the community. Where a proposal is made repeatedly, and essentially the same proposal is made again, without new evidence or arguments, only a short time after the close of the previous proposal, administrators closing the discussion may, based upon sentiments expressed in the discussion or an express request, impose a moratorium on future efforts to repeat the failed proposal for a period of time. A moratorium may also be imposed by a discussion achieving the clear consensus of the community.
In user conduct appeals, a moratorium on further appeals is not uncommon. They may also be established by discretionary sanctions which are fully under Arbcom's authority.
However, moratoria should be used with caution, and only within limits. Moratoria run counter to the general practice on Wikipedia that any editor may initiate a discussion on any topic related to the operations of the encyclopedia at any time (though not at any place). The duration of a moratorium should be balanced against the likelihood that consensus will change with time (or new information will develop). An existing moratorium may be lifted early if there is consensus to do so.