  Suggestions for efficiently determining the lifetimes and mass difference of
the light and heavy $B_s$ mesons ($B_s^L, B_s^H$) from $B_s \to J/ \psi \phi,
D_s^{*+}D_s^{*-}$ decays are given. Using appropriate weighting functions for
the angular distributions of the decay products (moment analysis), one can
extract $(\Gamma_H, \Gamma_L, \Delta m)_{B_s}$. Such a moment analysis allows
the determination of the relative magnitudes and phases of the CP-odd and
CP-even decay amplitudes. Efficient determinations of CP-violating effects
occuring in $B_s \to J/\psi \phi, D_s^{*+} D_s^{*-}$ are discussed in the light
of a possible width difference $(\Delta \Gamma)_{B_s}$, and the utility of this
method for $B \to J/\psi K^*, D^{\ast +}_s \bar D^{\ast}$ decays is noted.
Since our approach is very general, it can in principle be applied to all kinds
of angular distributions and allows the determination of all relevant
observables, including fundamental CKM (Cabibbo-Kobayashi-Maskawa) parameters,
as well as tests of various aspects of the factorization hypothesis. Explicit
angular distributions and weighting functions are given, and the general method
that can be used for any angular distribution is indicated.
