Learning while working has two distinctive features: Firstly, it refers to a form of self-education, in contrast to vocational training led by teachers and professional development through courses or lectures. Learning while working occurs in regular employment without guidance from a trained educator and without time off. Secondly, learning while working does not simply involve acquiring existing knowledge. Rather, workers develop new personal experiences through practical action. This experience increasingly pertains to methods for solving problems in knowledge-intensive work processes: Workers develop and test a solution approach, thinking it through.