  The succession of suggested mechanisms of solid-state phase transitions -
Second-order, Lambda, Martensitic, Displacive, Topological, Order-Disorder,
Soft-mode, Incommensurate, Scaling and Quantum - are analyzed and explained why
they cannot be realized in nature. All of them assume a cooperative structural
rearrangement as opposed to the only real one which is simply a variant of the
crystal growth. Like all kinds of crystal growth, a solid state phase
transition proceeds by molecule-by-molecule building building the crystal of a
different structure, while the surrounding original crystal is used as the
building material.
