Qualifications and skills in excess of those required at work are still valued in the labour market. On average, a tertiary graduate who holds a job requiring only an upper secondary qualification will earn less than if he or she were in a job requiring a tertiary qualification, but more than an upper secondary graduate in a job requiring upper secondary qualifications. Based on this information, the survey measures the use of a wide range of skills, including both information-processing skills, which are also measured in the direct assessment, and generic skills, for which only self-reported use at work is available.