  In this paper we develop a picture of Quantum Mechanics based on the
description of physical observables in terms of expectation value functions,
generalizing thus the so called Ehrenfest theorems for quantum dynamics. Our
basic technical ingredient is the set of tools which has been developed in the
last years for the geometrical formulation of Quantum Mechanics. In the new
picture, we analyze the problem of the dynamical equations, the uncertainty
relations and interference and illustrate the construction with the simple case
of a two-level system.
