In addition to the traditional classification, two recent proposals are given, neither of which accepts traditional "Mon–Khmer" as a valid unit. However, little of the data used for competing classifications has ever been published, and therefore cannot be evaluated by peer review.
Alongside the customary classification, two recent proposals are discussed, both of which do not consider traditional "Mon–Khmer" a valid category. However, the data used for these alternative classifications has rarely been published, making it impossible for peer review to evaluate it.