The evolution of detachment folding begins with the model assumption of a low-amplitude and short compressional environment with a mechanically dissimilar incompetent and competent unit.

Otherwise, the differences of potential would give rise to forces and movement of some parts of the liquid at the surface, which contradicts the static model assumption.

In classical terms, highly statistically significant (unlikely) events should make one question one's model assumptions.

Interpretations of these diagnostic tests rest heavily on the model assumptions.