In Foundations of Institutional Reality, Andrei Marmor provides a novel account of the ontological foundations of institutional facts, and argues that there are important epistemic and methodological implications that follow from this ontology. Marmor offers a grounding-reductive account of collective attitudes that comports with methodological individualism. He argues for a functional explanation of the constitutive relations between rules and practices, challenging Searle''s influential distinction between constitutive and regulative rules.The first part of the book offers a detailed reductive account of institutional facts by way of metaphysical grounding. It shows that an ontology of institutional facts requires an ontology of social rules, and the latter depends on a reductive account of collective attitudes. The second part of the book aims to show that there are a number of important epistemic and methodological conclusions that follow from the ontology of institutional facts. F