 A criterion of unity defended for its epistemic virtue in relation to evidence is simplicity, or parsimony (Sober 2013 and 2016). Comparatively speaking, simpler hypotheses, models or theories present a higher likelihood of truth, empirical support and accurate prediction. From a methodological standpoint, however, appeals to parsimony might not be sufficient. Moreover, the connection between unity as parsimony and likelihood is not interest-relative, at least in the way that the connection between unity and explanation is (Sober 2003; Forster and Sober 1994 and Sober 2013 and 2016).