Vasubandhu, one of the most famous Mahayana Buddhist Philosophers, wrote works on a vast variety of subjects. This collection of translations includes the Vada-Vidhi, a work on logic; the Panca-skandhaka-prakarana, which deals with the 'aggregates' making up 'personality'; the Karmasiddhi-prakarana, which in explaining psychic continuity, also attacks many features of earlier Buddhist Psychology; the famous Vimsatika and Trimsika, which take Buddhist psychology into hitherto unexplored areas; the Madhyanta-Vibhaga-bhasya, one of the most profound books for Mahayana realization; and the Tri-svabhava-nirdesa which shows a way for ridding consciousness of ensnaring mental constructions. A glossary of key words is included, as are the texts of those works which survive in Sanskrit. Each translation is prefaced by an explanatory introduction and is followed by notes. These include also references to other Indian philosophical systems and occasional comparisons with modern Western psychology systems, particularly where the latter seem inadequate in comparison with Vasubandhu's Yogacara.