The structure of nucleons and nuclei and nonperturbative QCD

This talk starts with brief review of current ideas concerning hadronic structure, with the conclusion that original nonrelativistic quark models may be justified. If so, investigations of multiquark system, being of great interest for nuclear physics, can be put much further with modern computational methods. As an experimental test of these ideas we consider nonperturbative ("higher twist") scaling violating effects in deep inelastic scattering, both on the proton and nuclear targets.