'Unemployment rate: Number of unemployed persons expressed as a percentage of the labour force. The concepts and definitions of employment and unemployment adopted by the survey are based on those endorsed by the International Labour Organisation (ILO). UNEMPLOYMENT: Given the concept of unemployment as the unutilized supply of labour, the operational definition of unemployment is based primarily on the activity of job search and the availability to take a job. In addition to being conceptually appropriate, job search activities can, in a household survey, be objectively and consistently measured over time. The definition of unemployment is therefore the following: Unemployed persons are those who, during reference week: a) were on temporary layoff during reference week with an expectation of recall and were available for work, or b) were without work, had actively looked for work in the past four weeks, and were available for work, or c) had a new job to start within four weeks from reference week, and were available for work.