<div><p>It can be hard for individuals to manage multiple group identities within their self-concept (e.g., being a Christian and a woman). We examine how the inter-identity fit between potentially conflicting identities can become more harmonious through a self-defining group philosophy for life. Specifically, we test the hypothesis that <i>holistic</i> group identities (based in group philosophies for life that prescribe the behavior of their members in any situation, such as religion) become more strongly related to other identities in the self-concept (e.g., gender) when they are strongly <i>self-defining</i> (i.e., devotedly applied to daily life). In three studies we investigated the inter-identity fit between individuals’ (highly hol...