Introduction: National accounts are the basic tools for planning and forecasting, as well as for the preparation of policies and economic strategies which are planned by decision makers in the State, beside its importance to the different sectoral and economical systems. The national accounts importance comes from the fact that it is used by many authorities, inside and outside the country. At the local level, the national accounts data are used as a measure of growth of economic and social development. It is also used to assess the economic situation at the macro and sectoral level according to international standards. The compilation and presentation of tables for macro-economic variables of national accounts of the State must have a high degree of accuracy and objectivity, to ensure the quality of its results and accuracy of its uses. At the international level, the national accounts variables are considered as the base for the purposes of international comparisons, in terms of economic performance levels of the country. Therefore, the National Bureau of Statistics is keen to provide the requirements of the preparation of the national accounts data, in a timely manner and with a high level of accuracy and reliability, so that it can meet the needs of all users. System of National Accounts (SNA) divides the economy into the following Sectors: - The Non-financial corporations sector - The Financial corporations sector which includes banks and insurance companies - The General government sector (Federal, local and insurance and pension funds) - The Non-profit institutions serving households - The Households sector. - The Rest of the world. The most important definitions used in national accounts: Output: Output consists of those goods and services that are produced within an establishment that become available for use outside that establishment. The output can also be retained by their owners for own final consumption or for own gross fixed capital formation, as is the case when the farmers who produce food crops. They keep some part of the output for their own consumption and put the other part in the market. Output varies in form, sometimes as goods and other times as services. The nature of output varies from one economic activity to another activity and from one sector to another. Intermediate Consumption: Intermediate consumption consists of the value of the goods and services consumed as inputs by a process of production and is divided into: 1) Intermediate Consumption of goods: such as raw materials, fuel, oil, spare parts and packaging materials, stationery, electricity, water and other supplies needed for production purposes. 2) Intermediate Consumption of service: such as maintenance and operating expenses and expenses on research and testing, transportation, transfer and processing services, hospitality expenses and gifts, costs of training programs, commissions and residential and non-residential rents and other required services. Gross Value Added: Gross Value added is the difference between value of output and value of intermediate consumption and is calculated at the level of institutional sectors and economic activities. Net Value Added: Net value added is the difference between gross value added and consumption of fixed capital. Consumption of Fixed Capital: Each capital good has some life span and has to be replaced after its useful life. Consumption of fixed capital is the decline, during the course of the accounting period, in the current value of the stock of fixed assets owned and used by a producer as a result of physical deterioration, normal obsolescence or normal accidental damage. Compensation of Employees: Compensation of employees is the sum of rewards in cash or in kind paid by the employer to an employee for work performed by the latter during the accounting period. Compensation of employees consists of the following: 1) Wages and salaries in cash: It includes wages and salaries paid in cash on a regular basis, weekly, monthly or as agreed in contract. 2) Benefits in kind: It includes all the goods and services provided to the employees without charge such as meals and drinks in restaurants and bars, furniture and transportation, tickets for personal travel, leisure services, housing, electricity and water etc. 3) Insurance benefits: It includes pension on retirement and the value of premiums paid for social insurance such as health insurance, life insurance, insurance against work injuries etc. Taxes on Production and Imports: It consists of taxes on products that are paid for goods or services produced, sold, transferred or disposed of. It also includes taxes and duties on imports that become payable when the goods enter economic zone by crossing the border or when services are provided from non-resident units to resident units. It further includes other taxes on production which consist mainly of taxes on the ownership or use of land or buildings or other assets. Operating Surplus: Operating surplus is balancing items in generation of income account and are defined as value added less compensation of employees less taxes paid on production plus subsidies received Gross Fixed Capital Formation: It is the value of acquisitions less disposals of new or existing fixed assets. Fixed assets consist of both tangible fixed assets (dwellings, other buildings and structures, other structures, transport equipment, other machinery and equipment etc.) and intangible fixed assets (computer software, entertainment, literary or artistic originals, etc.).