The physical "reality" is assumed to be the wave function of the whole universe itself.

[The Many-worlds interpretation is the] only completely coherent approach to explaining both the contents of quantum mechanics and the appearance of the world.

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As an analogy one can imagine an intelligent amoeba with a good memory. As time progresses the amoeba is constantly splitting, each time the resulting amoebas having the same memories as the parent. Our amoeba hence does not have a life line, but a life tree.

Quantum mechanics is reformulated, in a way which eliminates its present dependence on the special treatment of observation of a system by an external observer.