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· Gray: Dharmaguptakas
· Red: Sarvāstivādins
· Yellow: Mahāsāṃghikas
· Green: Pudgalavādins
· Orange: Vibhajyavādins
The early Buddhist schools refers to the Indian Buddhist "doctrinal schools" or "schools of thought" (Sanskrit: vāda) which arose out of the early unified Buddhist monastic community (saṅgha) due to various schisms in the history of Indian Buddhism. The various splits and divisions were caused by differences in interpretations of the monastic rule (Vinaya), doctrinal differences and also due to simple geographical separation as Buddhism spread throughout the Indian subcontinent.
The early Buddhist community initially split into two main Nikāyas (monastic groups, divisions), the Sthavira ("Elders"), and the Mahāsāṃghika ("Great Community"). This initial split occurred either during the reign of Aśoka (c. 268-232 BCE) or shortly after (historians disagree on the matter).[1]
Later, these groups became further divided on doctrinal grounds into numerous schools of thought and practice (with their own monastic rules and doctrinal Abhidharma texts). Some of the main sects included the Sarvāstivādins ("Temporal Eternalists"), the Dharmaguptakas ("Preservers of Dharma"), Lokottaravadins ("Transcendentalists"), the Prajñaptivādins ("Conceptualists"), the Vibhajyavādins ("the Analysts"), and the Pudgalavādins ("Personalists"). According to traditional accounts these sects eventually proliferated into 18 (or, less-commonly, 20) different schools.[2]
The textual material shared by the early schools is often termed the early Buddhist texts and these are an important source for understanding their doctrinal similarities and differences. There were are various works of Abhidharma and other treatises written by these various schools which contain more unique doctrines which were specific to each school.