There are 75 centrally recognized Particularly Vulnerable Tribal Groups (PVTGs) in India. This special category within the Scheduled Tribes was established during the Fourth Five-Year Plan based on the Dhebar Commission report (1960-61) and other studies, which highlighted disparities in development among tribal communities. Originally classified as "Primitive Tribal Groups" (PTGs), these communities were identified by the characteristics: pre-agricultural practices, reliance on hunting and gathering, zero or negative population growth, and relatively low literacy levels compared to other tribal groups.