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Apart from the use of strictly legal criteria, however, the problem of determining which groups and individuals are tribal is both subtle and complex. Because it concerns economic interests and voting blocs, the question of who are members of Scheduled Tribes rather than Backward Classes or Scheduled Castes is often controversial. Scholarly opinions also remain divided on this matter. In other parts of the world, the Adivasis or indigenous people are those who predate the colonizers. Many scholars, especially the westerners, claim that the Adivasis of India predate other communities of India. Indian scholars remain divided on this issue, for reasons best known to them. If one accepts that Adivasis predate all other mainstream societies one has to accept that other communities, including Hindus, are migrants in India. It would function as proof-text on "Aryan Invasion Theory” which most scholars (being its members) would vehemently deny it. At best, Adivasis have no say about their own identity. It has been decided politically as "Scheduled tribe". But even this title is controversial since it accepts them as a tribe. Will the Adivasis lose their tribe if they lose their Scheduled tribe status? The issue requires further clarification. Despite all these challenges, there are specific traits of Adivasis that distinguish them from other Indian communities. A number of traits have customarily been seen as establishing tribal rather than caste identity. These include language, social organization, religious affiliation, economic patterns, geographic location, and self-identification. Recognized tribes typically live in hilly regions somewhat remote from caste settlements; they generally speak a language recognized as tribal.