Proceedings of the XV UISPP World Congress (Lisbon, 4-9 September 2006), Vol. 35. Contents: Introduction (Marc Groenen & Didier Martens); 1) Application de la methodologie de l'Histoire de l'art a l'etude de l'art paleolithique: l'attribution des oeuvres anonymes a ses auteurs (Juan-Maria Apellaniz); 2) Les peintures de la grotte de la Pasiega A (Puente Viesgo, Cantabrie) a l'epreuve de la methode de l'attribution (Marc Groenen, Didier Martens); 3) The recognition of diversity through style in the Saharan rock-art research: an historiographic approach from the Western Sahara (Joaquim Soler Subils); 4) The rock art of South-Morocco revisited: On surprising stylistic and thematic characteristics of the so-called 'Pseudo-Bovidien' and 'Tazinien' rock art from the mid valley of Wadi Draa (Renate Heckendorf); 5) Spirals in Humahuaca and in the NW of Argentina (South America) Alicia Ana (Fernandez Distel, Jose Luis Mamani) . . ."