  In this paper we propose and explore a method of analysis of the scattering
experimental data for uniform liquid-like systems. In our pragmatic approach we
are not trying to introduce by hands an artificial small parameter to work out
a perturbation theory with respect to the known results e.g., for hard spheres
or sticky-hard spheres (all the more that in the agreement with the notorious
Landau statement, there is no any physical small parameter for liquids).
Instead of it guided by the experimental data we are solving the the
Ornstein-Zernike equation with a trial (variational) form of the inter-particle
interaction potential. To find all needed correlation functions this
variational input is iterated numerically to satisfy the Ornstein-Zernike
equation supplemented by a closure relation. We illustrate by a number of model
and real experimental examples of the X-ray and neutron scattering data how the
approach works.
