This volume focuses on the phenomenon of the Transition from the Middle to the Upper Palaeolithic in the Iberian Peninsula, with special reference to the site of Abric Romaní (Capellades, Barcelona), more broadly the northern Iberian sites, and the theoretical and typological systematics that have been used hitherto in the study of the transitional process. The core of the study is the development of the Transition from the latest Mousterian facies, to the appearance of the earliest Upper Palaeolithic. A secondary focus concentrates on the methods used until now to conduct similar studies.