In the framework of the history approach to quantum mechanics and, in
particular, of the formulation of Gell-Mann and Hartle, the question o
f the existence of inequivalent decoherent sets of histories is recons
idered. A simple but acceptably realistic model of the dynamics of the
universe is proposed and a particular set of histories is shown to be
decoherent. By suitable transformations of this set, a family of sets
of histories is then generated, such that the sets, first, are decohe
rent on the basis of the assumed dynamics of the universe and, secondl
y, are certainly inequivalent, apart from trivial special cases. Final
ly, the original set of histories is refined to get a model of the usu
al quasiclassical domain and it is shown, that, applying to it the pre
viously considered transformations, a family of sets of histories is o
btained which share typical properties of the usual quasiclassical dom
ain.