The two main groups that use multi are: - those that hate the wide range of weak 2 preempts and use the so-called "trash-multi" while keeping their weak 2s - those that want to have a broader preempt spectrum and have weak 2s through multi alongside 2M tartan/muiderberg Particularly this second group, I would say, also adopts 2NT as both MINORS, typ.5-5+, some just weak, some either weak or 17/18+, and thus has their 20-21 NT also in their multi. There is no crash between the weak and strong options, so I am not catching what the issue Kit W. shall have mentioned can be. Whichever group you're in, multi is there to widen your preempts, and does so very efficiently in many cases. But beware the abuse, the weakest preempts need to be well judged and you have to accept some isolated disasters, particularly if you adopt tartan/muiderberg 5-4 or better. It really is a lot seat a vulnerability dependent for the most. Multi shouldn't be played against less-than-average opponents IMHO and ought to be pre-alerted, although not obligatory, in formal events where its adoption is uncommon.