The volume contains 18 contributions from senior and junior scholars covering core issues within the theoretical investigation of the architecture and the mechanisms of the faculty of language, with particular emphasis on the computational component. They all pursue a comparative approach, investigating and comparing different languages and dialects or comparing different modes of acquisition, as in Adriana Belletti's work, to whom the volume is dedicated. The papers in the first part (by Chomsky, Rizzi, Bianchi & Chesi, Cinque, Costa, Calabrese) deal with theoretical issues such as labeling,...