2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83016I critically review the status of computations of threshold pion production in proton-proton collisions in the framework of effective field theory approaches or variants thereof. I also present the results of a novel diagrammatic scheme.12 pp, 5 figures, plenary talk, 8th International Conference on the Structure of Baryons (Baryons' 98), Bonn, Germany, Sept. 22-26, 1998, to appear in the proceedingsNuclear TheoryHigh Energy Physics - Phenomenologytext