The provision of high-quality health-services is only possible if it is based on vocational education of corresponding quality. To promote the quality of vocational education in speech therapy, a quality assurance programme was developed in a scientifically supervised multi-step process. The main goals of the quality assurance programme include: (i) external review of the quality of education by means of well-defined criteria, (ii) certification of schools that meet the requirements, and (iii) provision of feedback to schools about their results. A total of 208 quality indicators cover the essential aspects of vocational education in speech therapy, and apply to the structural, process and outcome quality. These indicators are based on a literature survey as well as on expert opinion, and are calibrated by data. The data are collected by using questionnaires (school management, teachers in speech therapy, students, consecutive patient sample) and are validated by specific document analyses and telephone audits. Each school receives an individual quality report of its achieved results benchmarked to other schools. Since the initial implementation in 2008, a total of 50 schools participated in the quality assurance programme and 41 achieved certification. Therefore, the defined set of quality criteria has been disseminated and utilized by about half of all German schools for vocational education in speech therapy. The evaluation of the data on quality collected across all schools highlights the strengths and weaknesses of vocational education as well as the demands for quality improvement.