Wiktionary
n. Any of various theoretical approaches that oppose rational-choice accounts of social phenomenon and, perhaps, positivism more generally.
Wikipedia
Reflectivism is a broad umbrella label, used primarily in International Relations theory, for a range of theoretical approaches which oppose rational-choice accounts of social phenomena and, perhaps, positivism more generally. The label was popularised by Robert Keohane in his presidential address to the International Studies Association in 1988. The address was entitled "International Institutions: Two Approaches", and contrasted two broad approaches to the study of international institutions (and international phenomena more generally). One was "rationalism", the other what Keohane referred to as "reflectivism". Rationalists — including realists, neo-realists, liberals, neo-liberals, and scholars using game-theoretic or expected-utility models — are theorists who adopt the broad theoretical and ontological commitments of rational-choice theory.