The National Sample Survey Office (NSSO) in Ministry of Statistics & Programme Implementation is responsible for conduct of large scale sample surveys in diverse fields, on All India basis. Primary data is collected regularly through nation-wide household surveys on various Socio Economic subjects, Annual Survey of Industries (ASI) under the Collection of Statistics Act and enterprise surveys, as a follow up of the Economic Census. Besides these surveys, NSSO collects data on rural and urban prices, plays a significant role in the improvement of crop statistics through supervision of the area enumeration and crop estimation surveys of the state agencies. It also maintains a frame of urban areal units for drawing samples for Socio-Economic Surveys in urban areas.