APPLIED CATEGORICAL STRUCTURES, cilt.11, sa.2, ss.185-206, 2003 (SCI-Expanded)
We 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.