The category of 'Particularly Vulnerable Tribal Groups' (PVTGs) was introduced in India because the broader classification of 'Scheduled Tribes' (STs) was found to be insufficient in addressing the unique and extreme vulnerabilities faced by certain tribal communities. While all Scheduled Tribes are considered marginalized, it became evident that some groups were significantly more backward and at a greater risk of extinction or severe exploitation than others. The need arose for a more nuanced approach to identify and target development interventions for these most vulnerable segments of the tribal population.

Why a new category was needed:

1. Heterogeneity within Scheduled Tribes: The Scheduled Tribes category is vast and diverse, encompassing groups with varying levels of development, socio-economic conditions, and cultural practices. Some STs have integrated more into mainstream society, while others remain largely isolated and untouched by development.
2. Extreme Backwardness: It was observed that certain tribal groups exhibited extremely low levels of development, often characterized by pre-agricultural practices, declining populations, and very low literacy rates, which were not adequately captured or addressed by general ST development programs.
3. Need for Targeted Interventions: The existing development schemes for STs, while beneficial, were often too broad to effectively cater to the specific and urgent needs of these highly vulnerable groups. A separate category allowed for the formulation of more focused, sensitive, and intensive development programs tailored to their unique challenges.
4. Risk of Extinction: Many of these groups faced the real threat of cultural erosion, demographic decline, and even extinction due to their extreme vulnerability to external pressures, diseases, and lack of access to basic services.

Why they are called 'Particularly Vulnerable': PVTGs are identified based on specific criteria that highlight their extreme vulnerability and backwardness compared to other tribal groups. These criteria, initially laid down by the Dhebar Commission (1960-61) and later refined, include:

1. Pre-agricultural level of technology: Many PVTGs still practice hunting-gathering, shifting cultivation (slash-and-burn agriculture), or primitive forms of agriculture. Their economic activities are largely subsistence-based, indicating a lack of integration into modern economic systems.
2. Stagnant or declining population: This is a critical indicator of extreme vulnerability. A declining or stagnant population suggests high mortality rates, low birth rates, or out-migration due to harsh living conditions, disease, malnutrition, and lack of healthcare, posing a threat to their very existence.
3. Extremely low literacy rates: PVTGs typically have significantly lower literacy rates compared to other tribal groups and the national average, indicating severe educational backwardness and limited access to formal education.
4. Subsistence economy: Their economy is often characterized by a low level of technology, minimal surplus production, and limited market integration. They rely heavily on forest produce and traditional livelihoods, making them highly susceptible to environmental changes and exploitation.
5. Geographic isolation: Many PVTGs reside in remote, inaccessible, and ecologically fragile areas, which further limits their access to government services, infrastructure, and mainstream development initiatives.

These combined factors make PVTGs highly susceptible to exploitation, disease, cultural erosion, and socio-economic marginalization. The term 'Particularly Vulnerable' accurately reflects their precarious situation, necessitating special protective measures and targeted development programs to ensure their survival, well-being, and cultural preservation.