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- Crossed modules and Whitehead sequencesPublication . Martins-Ferreira, NelsonWe introduce the notion ofWhitehead sequence which is defined for a base category together with a system of abstract actions over it. In the classical case of groups and group actions theWhitehead sequences are precisely the crossed modules of groups. For a general setting we give sufficient conditions for the existence of a categorical equivalence between internal groupoids and Whitehead sequences.