The National Sample Survey Office (NSSO) comes under Ministry of Statistic and Program Implementation headed by a Director General is responsible for conduct of large scale sample surveys in diverse fields on All India basis. Primarily data are collected through nation-wide household surveys on various socio-economic subjects, Annual Survey of Industries (ASI), etc. Besides these surveys, NSSO collects data on rural and urban prices and 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 area units for use in sample surveys in urban areas.The NSSO has four Divisions:1. Survey Design and Research Division (SDRD): This Division, located at Kolkata, is responsible for technical planning of surveys, formulation of concepts and definitions, sampling design, designing of inquiry schedules, drawing up of tabulation plan, analysis and presentation of survey results.2. Field Operations Division (FOD): The Division, with its headquarters at Delhi/Faridabad and a network of six Zonal Offices, 49 Regional Offices and 118 Sub-Regional Offices spread throughout the country, is responsible for the collection of primary data for the surveys undertaken by NSSO. 3.Data Processing Division (DPD): The Division, with its headquarters at Kolkata and 6 other Data Processing Centers at various places, is responsible for sample selection, software development, processing, validation and tabulation of the data collected through surveys.4. Co-ordination & Publication Division (CPD): This Division, located at New Delhi, coordinates all the activities of different Divisions of NSSO. It also brings out the bi-annual journal of NSSO, titled "Sarvekshana", and organizes National Seminars on the results of various Socio-economic surveys undertaken by NSSO.