  We will give a new model for measurements of a quantum system such that the
measuring apparatuses are described by a unital separable non-type I nuclear
simple C$^*$-algebra equipped with certain unital endomorphisms and pure
states. An interaction between the quantum system and the apparatus is
specified by a unitary associated with the combined system as before.
Magnifying to the classical level some aspects of the quantum system so
captured in the apparatus is explicitly done by applying the endomorphism; then
the resulting state is the superposition of {\em phases} with weights. Nature
will then choose each phase according to the probability prescribed by the
weights just as does one when multiple phases appear as in phase transition.
Thus in our model state-reduction (or collapse of the wave function) is a
primary event; whether this corresponds to the measurement of an observable or
which one if it does is another matter.
