Perhaps the most influential book ever written on the characteristics of men in politics is The Prince, by the great Renaissance Italian Nicolo Machiavelli (1469-1527). Despite its enduring popularity, fascination, and authority it is extremely one-sided and unsystematic. ... More systematic in its treatment of political man than The Prince, though about equally one-sided, is Hobbes' first section of The Leviathan entitled "Of Man." Hobbes' psychological assumptions bear a remarkable resemblance to the modern school of psychology often called Behaviorism. Robert A. Dahl, Modern Political Analysis (1963), p. 113