The HSP-VAT description of transport in Heterogeneous Medium includes the mathematical models, governing equations for both (or more) scales of the medium - lower spatial scale homogeneous governing equations and the upper scale heterogeneous governing equations -


See, for example, in few sciences as - in Fluid Mechanics
in Thermal Physics, and in any other science presented in our website.
Now, after more than 40 years of development we can firmly make assertion that for every science presented here that either the substantial progress has already appeared and is evident or the results those have been achieved render the mathematical rigidity and value of outcomes leaving no chance to homogeneous approaches used in these areas.