Context: International scholarship and policy tend to depict national structures governing Vocational Education and Training (VET) as uniform and devoid of internal differences. This macro perspective neglects the numerous processes at the meso and micro level that shape the structure and content of VET. This article focusses on professional associations (meso level) in Switzerland to examine the heterogeneity of governance of individual VET programmes that can exist within one country or one collective skill formation system.