"Table 3.1 Degrees of Conceptual Change provides a list of kinds of conceptual changes, roughly ordered in terms of degree of increasing severity. ... Adding new part-relations ... can be called decomposition. Conceptual change typically occurs in the part-hierarchy when new parts are discovered, as has often occurred in physics with the discovery of molecules, atoms, and subatomic particles. ... Caren (1985) discusses coalescence, adding a new superordinate kind that links two things previously taken to be distinct, and differentiation, making a distinction that produces two kinds of things."

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