The information on training participation needs to be complemented by an indication of the quantity and quality of the training received. To this end, the statistical framework includes an indicator regarding the volume of job-related training as well as an indicator that attempts to capture the quality of job-related training (measured as the worker's perception of whether the most recent training has helped improve work). Skills can be acquired not only via formal and non-formal education, but also informally. The paradox of job quality in the affluent economy.