Censuses: DOS conducts general censuses at irregular periods in the fields of population and housing units, agriculture, industry, and enterprises in accordance with the circumstances and available funds.

Annual Surveys: DOS carries out a lot of annual sample surveys in various demographic, household, agricultural, economic and environmental fields.

Quarterly Surveys: DOS carries out a number of quarterly sample surveys in the fields of employment and unemployment, industry, internal trade, construction, transport, services, crops and production sectors.

Monthly Surveys: DOS conducts some monthly surveys such as: Agricultural Prices, Consumer Prices and Prices of Industrial Production Quantities.

Periodic Surveys: DOS carries out periodic sample surveys in the fields of household income and expenditure, fertility and family health.