Everett was the first to realize what an excellent job quantum mechanics alone does of describing our perceptions (see Classical Perceptions and No Evidence for Particles). His assumptions were basically those of QMA; no particles and no collapse so that only the wave functions, with all the branches, exist. That is, there were many-worlds, with many versions of you as the observer.

Everett attempted to derive the probability law from these basic assumptions, but it doesn’t hold up, for the same reasons as are given in Probability and Constraints on Interpretations and Problems with Probability. Thus because it gives no singling-out mechanism—no version of me is singled out as the real me—the Everett interpretation is not satisfactory.

I believe, however, that the many-worlds interpretation comes very close (see the Mind-MIND interpretation). ‘All’ that is needed is a way of singling out the real me.