The introduction by Jeffrey Reitz focuses on the evolution of Breton's distinctive institutional framework, which both extends and in some ways alters John Porter's classic analysis in The Vertical Mosaic. Reitz shows how Breton's original concept of "institutional completeness" has been extended to provide a comprehensive framework for the institutional analysis of inter-ethnic relations, creating a unified theoretical structure that has reshaped the study of inter-ethnic relations in Canada and points toward a future research agenda.