a) Integrated Tribal Development Projects (ITDPs) are generally contiguous large areas of the size of one or more Development Block in which the ST population is 50% or more of the total population.
b) Modified Area Development Approach (MADA): These are identified pockets with a concentration of tribals 50% or more ST population within a total population of a minimum of 10,000 persons and above.
c) Clusters: These are identified pockets of tribal concentration containing 50% or more ST population within a total population of about 5,000 or more.
d) Primitive Tribal Groups (PTGs): Identified isolated communities among the STs characterized by a low rate of population, a pre-agricultural level of technology and extremely low levels of literacy.
e) Dispersed tribal population outside (a), (b), (c) and (d) above.