The Leading House LINCA investigates teaching and learning processes in the commercial sector of vocational education in Switzerland. A team of researchers from the University of Zurich has surveyed around 1,500 commercial trainees and more than 170 teachers in 36 schools over the past six years to address questions regarding the competence development of learners, perceptions of teaching quality, and the professional competence of teachers. This volume presents the key findings of the research program as well as conclusions for (vocational) school practice.