The II STOREP National Conference of the Italian Association for the History of Political Economy on "The Theory of Decision in the History of Political Economy" will be held in Siena, 3 and 4 June, 2005. Plenary speakers: Giacomo Becattini, Terenzio Cozzi, Marco Dardi, Robert Dimand, Massimo Di Matteo, Massimo Egidi, Daniel Ellsberg, Samuel Hollander, Bruna Ingrao, Brian Loasby, Siro Lombardini, Philippe Mongin, Aldo Montesano, Piero Tani, Alessandro Vercelli. Sessions: The theory of decision in the history of political economy; Foundations of theories of choice; Claudio Napoloni's thought; Classical economic thought from A. Smith to marginalist school; Cognitive approach to economics in a historical perspective; Some aspects about economic thinking and teaching; Macroeconomic consequences of individual action in Keynes's and Kalecki's tradition; The evolution of the French economic thought; Theory of growth; Round table on "Napoloni's answer to Sraffa"; The philosophy of probability and the theory of decisions; Recent developments on institutionalism; Economics and mathematics; Fredrich August von Hayek; Probability, uncertainty and competition; Controversial techniques and tools of economics; Keynes and decision theory; Alfred Marshall; Hicks, Keynes and Kaldor: uncertainty; money and employment; Walras, Pareto, and Keynes: some seminal roots of contemporary economics; Young scholars panel session. For further information and the complete programme see: http://www.storep.org/siena2005/index_en.htm Salvatore Rizzello