The employment level is defined as the number people engaged in productive activities in an economy. The concept includes both employees and the self-employed. The two main measures used for employment are the number of persons employed or the number of employees.
More complex measures of employment are sometimes produced by measuring the number of hours worked or by converting the number of hours into full-time equivalent units. In addition, some particular categories of employment are measured, such as part-time employment, female employment, self-employment, apprenticeships, homeworkers and unpaid employment (unpaid family workers and working proprietors).