DEFINITION: Employment rates are calculated as the ratio of the employed to the working age population. To calculate this employment rate, the population of working age is divided into two groups: those who are employed and those who are not. Employment is generally measured through household labour force surveys and, according to the ILO Guidelines, employed persons are defined as those aged 15 or over who report that they have worked in gainful employment for at least one hour in the previous week. Those not in employment consist of persons who are out of work but seeking employment, students and all others who have excluded themselves from the labour force for one reason or another, such as incapacity or the need to look after young children or elderly relatives. Working age is generally defined as persons in the 15 to 64 age bracket although in some countries working age is defined as 16 to 64.