As a layman's definition, would it be sufficient to define CM and QM differences as follows? CM: Macroscopic observations (theories) closely resembling the more accurate results that can be derived through QM. QM: Probability-based observations (theory) that more accurately describe the underlying reality, more applicable when applied to microscopic (or quantum) levels. Also, what of other approaches like Stochastic Electrodynamics (SED) that seems to combine the both disciplines? How realistic are such theories and do they hold any promise to supercede CM and QM? Thanks in advance for your replies.