linguistic:paraphrasing, information:highlighting
Tribal classification criteria and demands

The criteria presently followed for specification of a community as a Scheduled Tribe are : (i) indications of primitive traits, (ii) distinctive culture, (iii) geographical isolation, (iv) shyness of contact with the community at large, and (v) backwardness.

Population complexities, and the controversies surrounding ethnicity and language in India, sometimes make the official recognition of groups as Adivasis (by way of inclusion in the Scheduled Tribes list) political and contentious. However, regardless of their language family affiliations, Australoid and Negrito groups that have survived as distinct forest, mountain or island-dwelling tribes in India and are often classified as Adivasi. The relatively autonomous tribal groups of Northeastern India (including Khasis, Apatani and Nagas), who are mostly Austro-Asiatic or Tibeto-Burman speakers, are also considered to be tribals: this area comprises 7.5% of India's land area but 20% of its tribal population. However, not all autonomous northeastern groups are considered tribals; for instance, the Tibeto-Burman-speaking Meitei of Manipur were once tribal but, having been settled for many centuries, are caste Hindus.

It is also difficult, for a given social grouping, to definitively decide whether it is a "caste" or a "tribe". A combination of internal social organisation, relationship with other groups, self-classification and perception by other groups has to be taken into account to make a categorisation, which is at best inexact and open to doubt. These categorisations have been diffused for thousands of years, and even ancient formulators of caste-discriminatory legal codes (which usually only applied to settled populations, and not Adivasis) were unable to come up with clean distinctions.