2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49378I give a brief review of final state interactions in meson decays. I describe possible effects of FSI in K, D and B systems, paying particular attention to the description of the heavy meson decays. Available theoretical methods for dealing with the effects of FSI are discussed.9+ pages, Invited plenary talk at the Chicago Conference on Kaon Physics (Kaon'99), June 21-26, 1999, Chicago, ILHigh Energy Physics - Phenomenologytext