 The justification for selecting the Hamiltonian as the preferred observable ultimately lies in the success of MHI and its ability to solve interpretive difficulties (see Lombardi and Castagnino 2008, Sections 5 and 6). With respect to the first point: the scheme has been applied to several well-known physical situations (free particle with spin, harmonic oscillator, free hydrogen atom, Zeeman effect, fine structure, the Born-Oppenheimer approximation), leading to results consistent with empirical evidence. With respect to interpretation, MHI confronts quantum contextuality by selecting a preferred context, and has proved to be able to supply an account of the measurement problem, both in its ideal and its non-ideal versions; moreover, in the non-ideal case it gives a criterion to distinguish between reliable and non-reliable measurements, a criterion that can be generalized when expressed in informational terms (Lombardi, Fortin, and López 2015).