This is the third volume in the subset of volumes in the comparative syntax series devoted to the cartography of syntactic structures. Adriana Belletti has collected articles by top linguists that were originally presented at a workshop at the University of Siena in conjunction with a visit by Noam Chomsky. The articles go beyond mapping syntactic and semantic/pragmatic properties, also touching on broader questions, particularly related to the Minimalist Program and other recent theoretical developments. Contributors include Adriana Belletti, Alfonso Caramazza, Gennaro Chierchia, Guglielmo Cinque, Noam Chomsky, Richard Kayne, Jacques Mehler, Marina Nespor, Luigi Rizzi, Kevin Shapiro, and Michael Starke.