Table 2.

Weaknesses of historical terminology

Basis for Classification	Weaknesses Identified
Primary vs. secondary	Inconsistent use of terms across proposals Inappropriate cultural connotations following translation Concept not logically based on etiology
Dystonia‐plus	Inconsistent inclusion of different dystonias across proposals Arbitrary meaning of “plus” Concept not logically based on etiology
Heredodegenerative	Some disorders are hereditary, but not degenerative. Some disorders are degenerative, but not hereditary. Waste‐basket category with little value for organizing knowledge