Social factor: Population of community i.e. number, age , sex distribution Family details i.e. size ,relationship ,spacing of children. education i.e. literacy of men and women, access to books and news papers, children attending school, classes Housing facilities i.e. type ,floor ,ventilation ,rooms ,number of housemates Family type i.e. joint, nuclear, polygynous,patrilineal Caste i.e. OC/ST/SC Kitchen facilities ,location, type of fuel, drainage Water supply i.e. source and distance from house, purity Water facilities in India Economic factors. Occupation e g farmer, seasonally employed Family income e.g. wages, cash crop Tangible wealth i.e. land, live stock, transport mode, electronic media Family expenditure on food ,clothe, rent , feul.education,recreations Food prices: when the food prices go high, then the availability of food decreases.