Number of persons employed is defined as the total number of persons who work in the unit, including wage-earners and self-employed persons (i.e., working proprietors, partners working regularly in the unit and unpaid family workers) as well as persons who work outside the unit but who belong to it and are paid by it (e.g., sales representatives, delivery personnel, repair and maintenance teams). It excludes manpower supplied to the unit by other enterprises, persons carrying out repair and maintenance work in the unit on behalf of other enterprises, as well as those on compulsory military service.