Classification based on assimilation 1-2

B.K.Roy Burman in 1971 divided the tribal population into those who are;
I) Fully incorporated into the Hindu social order, can't be differentiated. Bhils
II) Positively oriented towards the Hindu social order. Santhals, Oraons.
III) Negatively oriented towards the Hindu social order. Mizos and the Nagas.
IV) Indifferent towards the Hindu social order. Arunachal tribes

Verrier Elwin proposed a fourfold classification:

Majumdar. Primitives. Adopted Hindu customs. Stay away.

Vidyarthi 1977