This note presents a new electoral studies research program that will examine party and voter behaviour in 27 elections (national, supra-national, and sub-national) in five countries (Canada, France, Germany, Spain, and Switzerland) and that includes a series of experiments designed to complement the analyses of these 27 elections. The purpose is to ascertain how the rules of the game, especially the electoral system, and the competitiveness and salience of elections influence the reciprocal relationship between voters and parties.