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How can scholars reconstruct the teachings of the historical Buddha when the earliest surviving texts were written down centuries after his death, and by communities that had already diverged on fundamental points of doctrine? This question defines the study of Early Buddhism. The subfield does not examine a single, stable entity called "early Buddhism" but instead investigates a period of intense creativity and disagreement, stretching from the Buddha's lifetime (roughly the 5th century BCE) through the formation of the first sectarian schools and the rise of systematic scholasticism (roughly the 7th century CE). The six frameworks that structure this history—Pre-sectarian Buddhism, Abhidharma, Mahasamghika, Sthaviravada, Dharmaguptaka, and Sarvastivada—represent different answers to the pressures of preserving, interpreting, and authorizing the Buddha's legacy.
The earliest framework, Pre-sectarian Buddhism, is not a school that existed in antiquity but a scholarly reconstruction of the teachings common to all later traditions before the first schism. Scholars working with comparative philology, the Pali Nikayas, the Chinese Agamas, and fragments from Sanskrit and Gandhari manuscripts attempt to isolate a stratum of doctrine that predates the sectarian divisions visible in the 3rd century BCE. This reconstructed core includes the Four Noble Truths, the Noble Eightfold Path, the doctrine of dependent origination (pratītyasamutpāda), the analysis of the five aggregates (skandhas), and the monastic code (Vinaya) in a relatively simple form. The central methodological challenge is that no manuscript from this period survives. Every extant source is a sectarian product, so identifying the pre-sectarian layer requires careful argument about which elements are shared across traditions and which are later additions. The framework of Pre-sectarian Buddhism thus functions as a hypothesis: it posits a unified teaching that later schools inherited and transformed, and it remains a live area of disagreement, with some scholars arguing that the very idea of a single original teaching is anachronistic.
The first major division in the Buddhist community, traditionally dated to around the 3rd or 4th century BCE, produced two competing frameworks: Mahasamghika (the "Great Community") and Sthaviravada (the "Teaching of the Elders"). These two schools did not merely disagree on monastic discipline; they held fundamentally different views about the nature of the Buddha and the ideal of the arhat. The Sthaviravada maintained that the Buddha was a human being who attained enlightenment through extraordinary effort, and that the arhat—a disciple who has achieved liberation—was fully equivalent to the Buddha in terms of awakening. The Mahasamghika, by contrast, advanced a transcendent view of the Buddha: he was a supramundane being who had appeared in the world out of compassion, and his apparent human life was a skillful means. For the Mahasamghika, the arhat was still subject to certain subtle defilements and was therefore inferior to a fully enlightened Buddha. This disagreement had enormous consequences. The Mahasamghika's transcendent Buddha provided a doctrinal foundation for the later Mahayana cult of celestial Buddhas and bodhisattvas, while the Sthaviravada's human Buddha anchored a tradition that emphasized the arhat ideal and the monastic path. The two frameworks coexisted for centuries, with the Mahasamghika flourishing in parts of India and later influencing Chinese Buddhism, while the Sthaviravada became the dominant lineage in Sri Lanka and Southeast Asia.
During the same period that the Mahasamghika and Sthaviravada were developing their distinctive doctrines, a new method of inquiry emerged that cut across sectarian lines: Abhidharma. The Abhidharma framework represents a shift from the narrative and pedagogical style of the early sutras to a systematic, analytical, and often highly technical mode of philosophy. Abhidharma texts do not tell stories about the Buddha's life; they compile lists (matikās) of ultimate realities (dharmas), classify them by type, and analyze their causal relationships moment by moment. For example, where a sutra might say "the mind is afflicted by greed," an Abhidharma text would break that statement down into a series of discrete mental factors (cetasikas), each with its own definition, function, and relationship to consciousness. This method was not a rejection of the earlier teachings but a narrowing and formalization of them. The Abhidharma project aimed to provide an exhaustive map of experience, showing exactly which dharmas were wholesome, unwholesome, or neutral, and how they conditioned rebirth and liberation. Every major school developed its own Abhidharma collection, and the differences between these collections became a key site of sectarian identity. The Abhidharma framework thus coexisted with the earlier narrative tradition, absorbing and transforming its content into a scholastic system that would dominate Buddhist philosophy for centuries.
The Sthaviravada tradition itself did not remain unified. By the 2nd century BCE, it had splintered into several sub-schools, two of which became especially influential: Sarvastivada and Dharmaguptaka. Both accepted the basic Sthaviravada framework—the human Buddha, the arhat ideal, and the authority of the early sutras—but they diverged sharply on metaphysics and practice.
The Sarvastivada ("the doctrine that all exists") is best known for its theory of temporal realism. To explain how karma could produce results across time, the Sarvastivada argued that dharmas exist in all three times—past, present, and future—simultaneously. A past action, on this view, is not gone; it persists as a real entity that conditions future experience. This position allowed the Sarvastivada to give a rigorous account of karmic causality, but it also generated intense debate. Opponents, including the Dharmaguptaka, argued that the Sarvastivada theory contradicted the Buddha's teaching of impermanence: if dharmas exist permanently, how can anything truly change? The Dharmaguptaka instead favored a more conventional temporal framework, in which only present dharmas are real and past actions influence the future through a causal continuum rather than through the literal persistence of past entities.
Beyond this metaphysical disagreement, the Dharmaguptaka distinguished itself by emphasizing the bodhisattva path and the veneration of stūpas (reliquary mounds). While the Sarvastivada focused on the arhat as the ideal, the Dharmaguptaka gave greater attention to the figure of the bodhisattva—a being who postpones final liberation to help others—and to the practice of making offerings at stūpas. This orientation brought the Dharmaguptaka closer to the Mahasamghika's transcendent Buddha and to the emerging Mahayana sensibility, even though the Dharmaguptaka remained formally a Sthaviravada school. The two frameworks thus coexisted and competed, with the Sarvastivada dominating in Kashmir and Central Asia and the Dharmaguptaka establishing a strong presence in China, where its monastic code (Vinaya) was adopted by many Chinese Buddhist communities.
In contemporary scholarship, no single framework from this period is treated as authoritative. Instead, the six frameworks function as tools for understanding different aspects of early Buddhist history. Pre-sectarian Buddhism remains a leading framework for scholars who use comparative textual analysis to reconstruct the earliest teachings; the main disagreement here is whether such a reconstruction is even possible, given that all sources are sectarian. The Abhidharma framework is central to the study of Buddhist philosophy and psychology, with scholars analyzing its taxonomies as precursors to later Indian and Tibetan scholasticism. The Mahasamghika framework is crucial for tracing the origins of Mahayana Buddhism, though scholars disagree on whether the Mahasamghika directly caused the Mahayana or merely created a doctrinal environment in which it could emerge. The Sthaviravada framework, particularly through its Pali canon, is the primary source for most introductory courses on Buddhism, but its reliability as a record of the Buddha's own words is hotly debated. The Sarvastivada and Dharmaguptaka frameworks are studied for their contributions to metaphysics, karma theory, and monastic law, with the Sarvastivada's temporal realism receiving particular attention from philosophers interested in the problem of causation.
What the leading frameworks agree on is that the early period was one of dynamic pluralism, not monolithic unity. The disagreements center on how to weigh the evidence: should the Pali canon be privileged because it is the most complete early collection, or should equal weight be given to the Chinese Agamas and Sanskrit fragments? Is the Abhidharma a faithful systematization of the Buddha's teachings or a scholastic distortion? Did the Mahasamghika's transcendent Buddha represent a genuine innovation or a recovery of a strand of teaching that the Sthaviravada had suppressed? These questions remain open, and they ensure that the study of Early Buddhism is not a matter of simply describing what happened but of arguing about how we can know what happened at all.