This paper assesses the Everettian approach to the measurement problem,
especially the version of that approach advocated by Simon Saunders and David
Wallace. I emphasise conceptual, indeed metaphysical, aspects rather than
technical ones; but I include an introductory exposition of decoherence. In
particular, I discuss whether -- as these authors maintain -- it is acceptable
to have no precise definition of 'branch' (in the Everettian kind of sense).Comment: 42 pages, no figures: a pdf file. A version of this paper will appear
in a CTNS/Vatican Observatory volume on Quantum Theory and Divine Action, ed.
Robert Russell et a
