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@TheRealNihilist
There's no specific metric, but rather a kind of holistic evaluation. If the proposals do not work, there will likely be complaints from the userships end and/or difficulties on moderation's end which will indicate that they are not working. If I get the sense that either of these things are the case, I would likely refer the policies back to the usership via a MEEP process so that the site's usership can render their verdict on the issue.