Talk:Additional-member system

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By-elections

It would be good to expand the article with implications of by-elections. Rankedchoicevoter (talk) 13:10, 6 September 2024 (UTC)[reply]

How proportional are AMS results?

The lead says (but doesn't cite) that AMS is generally very proportional where it's been used.

If this is the case, my thoughts are we should:

Rewrite the MMP page to make it about all kinds of MMP systems, and transfer anything specific to the traditional dual-vote, seat-linkage system over here.
Use this page to talk about the specific system people usually mean by "MMP", i.e. compensatory seat-linkage with separate party+candidate votes.

– Closed Limelike Curves (talk) 23:31, 28 September 2024 (UTC)[reply]

I don't know about that. I opted to clean in up as a specifically UK name for a specific system used here (even if basically the same model is used elsewhere) because in the literature AMS seems to not longer be used as a general term. So the article is written in a way that AMS is a UK and only a UK thing, even if the exact same parameters would be used elsewhere. So we say not only is Lesotho not AMS, but Bolivia, South Korea and others aren't either (unless someone finds sources that locally they call it AMS primarily, instead of something else).

I think this approach is not the same as if let's say we had a separate page for IRV under the name "alternative vote" just because in the UK (and maybe elsewhere too) that's what they call it primarily. One, there is already a lot of confusion. If AMS has been phased out in the literature, let's ease on it by phasing it out wikipedia, except where we cannot and maybe should not, this specific system. It would be more inaccurate to conflate this particular system with MMP in general anyway. Otherwise we will get into arguments like, so is South Korea AMS or is it an AMS/parallel hybrid? Is Lesotho (one vote), Bolivia (two vote with one being DSV) AMS? Is New Zealand AMS? It is also two votes and seat linkage and in practice has similar ratios and few re-added overhang seats. So German Lander also use AMS? Then what is MMP? Is scorporo "an" AMS too, because some source once referred to is as "a variant of AMS"?

Well I say let's keep MMP as a general term and clear up things there, including how my MMP they sometimes mean specific systems, like in New Zealand.

We keep AMS as a UK quirk in naming, phasing out the use of "an AMS" system elsewhere, so we don't say any other country uses AMS, but we say they use a two-vote / one vote seat linkage compensatory (mixed) system for/of MMP, the same way we say Australia uses the single transferable vote for PR or STV type of PR system, or Lithuania uses a two-round, parallel voting type of MMM. We keep the name AMS for the UK because that's what locally used there and we look into it more, if someone in the know insist that locally they know in another country a system as AMS or MMP, and clear that up too in the respective article.

So I don't think we need an explicit page for two-vote seat linkage FPTP+PR in general. We will explain that in the "seat linkage" page, which will cover this but also one vote seat linkage "MMP", among other things that are under the concept of seat linkage.

So:

-MMP - general principle of MMP, variants, terminology clearup

-AMS - specific UK name for a more or less specific system. I think it can stay, but if there is a consensus that there is not enough there, I think it should be merged into MMP, not into seat linkage.

-Seat linkage - mechanism which is used not only in mixed systems, but pure PR too and actually some non compensatory or at least compensatory to non proportional too (I have found some sources for this) Rankedchoicevoter (talk) 19:23, 29 September 2024 (UTC)[reply]