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Everett's no-collapse formulation of quantum mechanics was a reaction to problems that arise in the standard von Neumann-Dirac collapse theory. Everett's proposal was to drop the collapse postulate from the standard theory, then deduce the empirical predictions of the standard theory as the subjective experiences of observers who are themselves treated as physical systems described by his theory. It is, however, unclear precisely how Everett intended for this to work. Consequently, there have been many, mutually incompatible, attempts at trying to explain what he in fact had in mind. Indeed, it is probably fair to say that most no-collapse interpretations of quantum mechanics have at one time or another been attributed to Everett.

Hmm, it kind of reads like stereo instructions. ;)