  Dalitz plot studies for multi-hadron decays of heavy mesons are expected to
become very important tools for precision investigations of CP violation. A
thorough understanding of the hadronic final-state interactions is a
prerequisite to achieve a highly sensitive, model-independent study of
CP-violating phases in such processes. We illustrate the theoretical tools
available, as well as still to be developed, from low-to-medium-energy hadron
physics for this purpose, and the goals of the informal "Les Nabis" network
studying these and related problems.
