 A number of Vasubandhu’s shorter independent works are also available. The Explanation of the Establishment of Action (Karmasiddhiprakaraṇa) draws together, synthesizes and advances somewhat the many discussions of karma from the Treasury of the Abhidharma—adding a defense of the Yogācāra concept of the “storehouse consciousness” (ālayavijñāna). The Explanation of the Five Aggregates (Pañcaskandhaprakaraṇa) is a summary of central Abhidharma terminology that includes some Yogācāra cross-referencing as well. The Rules for Debate (Vādavidhi) is lost, but numerous fragments preserved in later texts show it to be foundational for the development of formal Buddhist logic and  epistemology.[14]