  Stemming from de Finetti's work on finitely additive coherent probabilities,
the paradigm of coherence has been applied to many uncertainty calculi in order
to remove structural restrictions on the domain of the assessment. Three
possible approaches to coherence are available: coherence as a consistency
notion, coherence as fair betting scheme, and coherence in terms of penalty
criterion. Due to its intimate connection with (finitely additive) probability
theory, Dempster-Shafer theory allows notions of coherence in all the forms
recalled above, presenting evident similarities with probability theory. In
this chapter we present a systematic study of such coherence notions showing
their equivalence.
