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Radiosity does not account for specular reflections (i.e. it only handles diffuse reflections). Whitted's ray-tracing only considers glossy or diffuse reflection, possibly mirror-reflected. And finally, Kajiya's path-tracing is the most general one [2], handling any number of diffuse, glossy and specular reflections.
So I think it depends on what you means ...
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The goal of Heitz et al.'s model is pretty much the opposite of subsurface scattering: They only consider surface scattering, i.e. the ray can never enter the material.
Because microfacets are statistical in nature, they can recast their problem in such a way that it can be solved by microflakes, which allows them to compute properties such as the mean free ...
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When I was first reading about all of this I stumbled upon this link which helped me better understand this large subject. Also this goes into some more detail on things mentioned here.
Light scattering is a natural phenomenon which arises when light interacts with particles distributed in a media as it travels through it. From Wikipedia:
Light scattering ...
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