 The theory of social choice in its modern incarnation originated in Arrow’s pioneering work. Arrow himself described it as a ‘subversive’ attempt to ‘operationalize’ the Bergson-Samuelson approach (Arrow 1983, 26), but it could equally be viewed as extending the tradition of earlier work on voting and committee decisions, going back to Condorcet and Black.  It has developed into an immense literature, with many ramifications to a variety of subfields and topics. The social choice framework is, potentially, so general that one may think of using it to unify normative economics.  In a restrictive definition, however, social choice is considered to deal with the problem of synthesizing heterogeneous individual preferences into a consistent ranking. Sometimes an even more restrictive notion of “Arrovian social choice” is used to name works which faithfully adopt Arrow’s particular axioms.