2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125524We review recent progress in our understanding of elastic and inelastic pion reactions on two nucleon systems from the point of view of effective field theory. The discussion includes pion-deuteron scattering, gamma d to pi-nn, and NN to NNpi. At the end some remarks are made on strangeness production reactions.30 pages; based on a lecture series held at the international workshop "Physics and Astrophysics of Hadrons and Hadronic Matter" at the Visva Bharati University, Shantiniketan, India, Nov. 2006Nuclear Theorytext