India is a country of vast cultural and topographic diversity; with that comes differences in tastes and preferences, habits and consumption levels. Determining CPI (Consumer Price Index) by grouping Indians on the basis of their occupation in rural and urban areas might fail to capture the true value of consumption and expenditure.
The Cost of Living Index (COLI) aims at determining the cost of living in India by considering the magnitude of variances or differences in consumption patterns at the ground level of our country based on needs and preferences. 
It follows an approach of expenditure-based determination with the sample based on topological diversification.
You can also contribute to this Project by taking our survey – Link