2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59738We give a detailed description of the structure of the actor 2-crossed module related to the automorphisms of a crossed module of groupoids. This generalises work of Brown and Gilbert for the case of crossed modules of groups, and part of this is needed for work on 2-dimensional holonomy to be developed elsewhere (see math.DG/0009082).19 pages, A4 size,LaTeX2E,xypic New version December 10, 2001. To appear in Applied Categorical StructuresCategory TheoryAlgebraic Topology20L05,18D15,18D35,55D15,55U99text