What is the defining characteristic separating HTS from low-throughput methods?

Answer

The drastic miniaturization of the assay

The shift to miniaturized formats, such as 384-well or 1536-well plates, is the characteristic that enables the handling of larger libraries by reducing the necessary volumes of reagents and compounds.

What is the defining characteristic separating HTS from low-throughput methods?
technologymethodscreeninglaboratoryassay