  In response to recent criticisms by Okon and Sudarsky, various aspects of the
consistent histories (CH) resolution of the quantum measurement problem(s) are
discussed using a simple Stern-Gerlach device, and compared with the
alternative approaches to the measurement problem provided by spontaneous
localization (GRW), Bohmian mechanics, many worlds, and standard (textbook)
quantum mechanics. Among these CH is unique in solving the second measurement
problem: inferring from the measurement outcome a property of the measured
system at a time before the measurement took place, as is done routinely by
experimental physicists. The main respect in which CH differs from other
quantum interpretations is in allowing multiple stochastic descriptions of a
given measurement situation, from which one (or more) can be selected on the
basis of its utility. This requires abandoning a principle (termed unicity),
central to classical physics, that at any instant of time there is only a
single correct description of the world.
