2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165286Promotion and evacuation are bijections on the set of linear extensions of a finite poset first defined by Schutzenberger. This paper surveys the basic properties of these two operations and discusses some generalizations.28 pages, 6 figures. Minor corrections and additional referencesCombinatorics06A07text