A number of computational methods for the description of the ligand-recepto
r interaction that were developed in the past decade are reviewed in this p
aper. The central two sections introduce the methods that are already estab
lished as useful tools for the qualitative and quantitative description of
ligand-receptor complexes, either when the detailed atomic structure of the
receptor is known or not. The following section gives two examples of the
application of the described methodology on two limiting cases.