The Abhisamayālaṃkāra (Ornament for clear realization) is an instructional treatise on the Prajñāpāramitā, or Perfect Wisdom, whose authorship is traditionally attributed to Maitreyanātha (c. 350 ce). As a technical treatise, the Abhisamayālaṃkāra outlines within its 273 verses the instructions, practices, paths, and stages of realization to omniscient buddhahood mentioned in Prajñāpāramitā scriptures. In its abridged description, the Abhisamayālaṃkāra furnishes a detailed summary of the path that is regarded as bringing out the “concealed meaning” (sbas don, garbhyārtha) of Prajñāpāramitā. The Abhisamayālaṃkāra contains eight chapters of subject matter, with a summary of them as the ninth chapter. The eight subjects (padārtha) of the eight chapters (adhikāra) correspond to eight clear realizations (abhisamaya) that represent the knowledges, practices, and result of Prajñāpāramitā. The Abhisamayālaṃkāra’s eight clear realizations are types of knowledge and practices for bodhisattvas (“buddhas-in-training”) to achieve buddhahood set forth within the system of the five paths (lam lnga, *pañcamārga) common to Indian abhidharma and Yogācāra literature. The first three clear realizations are types of knowledge that comprise Perfect Wisdom. Total Omniscience, or the wisdom of all aspects (sarvākārajñatā, rnam pa thams cad mkhyen pa nyid), is regarded as the fundamental wisdom and the central concept of Prajñāpāramitā. Total Omniscience is direct, unmediated knowledge that exactly understands the manner of reality to its fullest possible extent in all its aspects. Path-omniscience (mārgajñatā, lam shes nyid) comprises the Buddhist path systems of śrāvakas, pratyekabuddhas, and bodhisattvas mastered by bodhisattvas. Empirical Omniscience (vastujñāna, gzhi shes) cognizes empirical objects in conditioned existence that are to be abandoned. It correlates to knowledge that is comprehended by śrāvakas and pratyekabuddhas. The path to buddhahood itself and the detailed means of its application are covered in the Abhisamayālaṃkāra by the fourth through seventh clear realizations. The fourth chapter is devoted to the realization of wisdom of all aspects (sarvākārābhisaṃbodha, rnam rdzogs sbyor ba), a yogic practice that enables a bodhisattva to gain a cognition of all the aspects of the three types of omniscience. The fifth realization is the summit of full understanding (mūrdhābhisamaya, rtse sbyor), whereby yogic practices reach the culmination of cognizing emptiness. The sixth chapter defines the gradual full understanding (anupūrvābhisamaya, mthar gyis sbyor ba) of the three forms of omniscience. The seventh abhisamaya clarifies the “instantaneous realization” (ekakṣaṇābhisamaya) that occurs at the final moment right before buddhahood. Abhisamayas four through seven are known as “the four methods of realization” of the three types of knowledge. The eighth realization, and last subject in the Abhisamayālaṃkāra, is the realization of the dharma body (dharmakāyābhisamaya). In this way, the first three realizations describe the cognitive attainments of buddhas, the middle four realizations discuss the methods that take the cognitive attainments as their object, and the eighth realization describes the qualities and attainments of the dharma body, the resultant body of buddhas. The treatise was extensively commented upon in Indian Buddhism and has been widely studied in Tibetan forms of Buddhism up to the present day.