  The connection is established between two theories that have developed
independently with the aim to describe quantum mechanics as a stochastic
process, namely stochastic quantum mechanics (sqm) and stochastic
electrodynamics (sed). Important commonalities and complementarities between
the two theories are identified, notwithstanding their dissimilar origins and
approaches. Further, the dynamical equation of sqm is completed with the
radiation terms that are an integral element in sed. The central problem of the
transition to the quantum dynamics is addressed, pointing to the key role of
diffusion in the emergence of quantization.
