  As already known for nonrelativistic spinless particles, Bopp operators give
an elegant and simple way to compute the dynamics of quasiprobability
distributions in the phase space formulation of Quantum Mechanics. In this
work, we present a generalization of Bopp operators for spins and apply our
results to the case of open spin systems. This approach allows to take the
classical limit in a transparent way, recovering the corresponding
Fokker-Planck equation.
