Everyday identity change is common after conflict, as people attempt to move away from oppositional group relations and closed group boundaries. This article asks how it scales up and out to impact these group relations and boundaries, and what stops this? Theoretically, the article focusses on complex oppositional configurations of groupness, where relationality and feedback mechanisms (rather than more easily measured variables) are crucial to change and continuity, and in which moral authority is a key node of reproduction. It uses (...) the normatively weighted concept of transformation to augment existing research on boundary and identity change, while elaborating it to recognise the role of everyday agency in furthering change and moral inertia in impeding it. Substantively, the article compares the processes of everyday transformation of groupness in three cases that are very similar in historical depth, social embeddedness, symbolic opposition and everyday change, but very different in time-scale and with contrasting outcomes: successful transformation of reformation religious groupness; partial transformation of national groupness; and failed transformation of complexly-configured ethnic groupness in Northern Ireland. This allows tracing of the patterns and mechanisms at work. To anticipate, the article argues that everyday identity change can erode the moral authority of groupness. Its impact is generational and dependent on institutional linkages. The article highlights the importance of moral mechanisms as drivers of and obstacles to change; and it suggests ways that the obstacles could be overcome by radical policy interventions. (shrink)