 Evidence. The probabilistic model dovetails with other recent formal discussions of unity and coherence within the framework of Bayesianism (Forster and Sober 1994, sect. 7; Schurz and Lambert 2005 is also a formal model, with an algebraic approach). More generally, the probabilistic framework articulates formal characterizations of unity and introduces its role in evaluations of evidence. As in the dual relation to explanation, also in this case, unification is not a condition for relevant evidence but a criterion of evidence (for a non-probabilistic account of the relation between unification and confirmation, see Schurz 1999). The evidentiary role of unification of hypotheses or models is related, but not reducible, to the evidentiary role of synthesis of data in statistics. 