The rationality concept has figured prominently in some of the most fascinating  heartfelt  and at times acrimonious scholarly exchanges among political scientists This research paper focuses on five important intellectual developments in the study of rationality from a political science perspective: (1) the 1960s as an important era in scholarly exploration of the relationship between public policy making  decision making  and rationality  (2) Herbert Simon’s seminal and hugely influential theorizing on decision making and the limits of individual rationality  (3) the legacy of bounded rationality  particularly in Graham Allison’s models of decision making  (4) the seminal work of a group of economists and political scientists during the 1950s and 1960s who figured prominently in the emergence of modern rational choice theory  and (5) the modern scholarly debate over rational choice