The volume is an introduction to one of the key concepts in Tibetan Buddhist epistemology, namely the object of cognition. The volume provides an overview of the notion of cognizable objects in Sa Skya Paṇḍita (1182–1251), a short summary of Western research on that concept, followed by an edited translation of the first chapter of his fundamental work Tshad ma rigs gter together with the canonical commentary by Go rams pa (1429–1489). Both texts are translated into a European language for the first time.