  We review exact formalisms for describing the dynamics of liquids in terms of
static parameters. We discuss how these formalisms are prone to suffer from
imposing restrictions that appear to adhere to common sense but which are
overly restrictive, resulting in a flawed description of the dynamics of
liquids. We detail a fail-safe way for modeling the scattering data of liquids
that is free from any unwarranted restriction and that models the scattering
using the fewest possible number of free parameters. We also list some common
habits in analyzing data and how these habits do not do justice to the accuracy
of the results obtained in scattering experiments, and how these habits may
stand in the way of rejecting some models used in describing the dynamics of
liquids.
