Persons employed in the sense of the ILO are those who worked for any amount of time, if only for one hour, in the course of the reference week. This notion is different from that of employment in the sense of the population census, which concerns persons having declared they had a job on the census form.
The notion of employment in the sense of the ILO is therefore broader than that in the sense of the population census. Some people may consider that occasional jobs are not worth declaring in the census. The measurement of employment in the sense of the ILO can be made only through specific questions, such as those of the Labour Force Survey (LFS), one of the primary objectives of which is this measurement.