Ashok Mitra, a distinguished Indian demographer and economist, proposed a classification of Indian cities in the 1960s based on their predominant economic function. This method aimed to provide a functional understanding of urban centers, reflecting their role in the national economy, and was significant for urban planning in post-independence India.

Mitra's classification primarily used occupational structure data from the Census of India, specifically the proportion of the male working population engaged in different economic activities. He categorized cities into several functional types:

1. Manufacturing Cities: High proportion of male working population in manufacturing and industrial activities (e.g., Jamshedpur, Coimbatore, Kanpur).
2. Trade and Commercial Cities: Significant male workforce involved in trade, commerce, banking, and related activities (e.g., Mumbai, Kolkata, Delhi).
3. Service Cities: A broad category where the tertiary sector dominates, including:
   • Administrative Cities: High concentration of government offices (e.g., New Delhi, Chandigarh).
   • Cultural/Religious Cities: Primary function revolves around pilgrimage or heritage (e.g., Varanasi, Puri).
   • Educational Cities: Known for universities and educational facilities (e.g., Pune, Aligarh).
   • Tourism Cities: Tourism is a major economic activity (e.g., Jaipur, Agra).
4. Mining Cities: Developed primarily due to significant mineral resources and mining operations (e.g., Dhanbad).
5. Transport Cities: Important nodes for transportation and communication (e.g., Mughal Sarai).

Methodology and Significance: Mitra used a statistical method, often involving deviation from the national average for each occupational category, to identify the dominant function. Its significance lies in providing a functional understanding of cities, which was crucial for targeted urban planning and policy formulation. It helped identify regional economic specializations and the spatial distribution of economic activities.

Criticisms and Limitations:

1. Monofunctional Bias: Many modern cities are increasingly multifunctional, with diverse economic bases, which this classification struggles to capture.
2. Dynamic Nature of Cities: Urban functions change over time, and a classification based on a specific census might not reflect these shifts.
3. Data Dependency: Relies heavily on the availability and accuracy of occupational data.
4. Male Workforce Focus: Primarily focused on the male working population, potentially not fully representing the entire economic activity.

Despite these limitations, Ashok Mitra's classification remains a significant contribution to Indian urban geography and planning, offering a valuable framework for understanding the functional diversity of Indian cities during a crucial period of national development.