From a societal perspective, vocational education and training must enable young adults to meet the challenges of the labour market in a globalized world, reduce the mismatch of supply and demand of qualifications (e.g. youth unemployment leading to disadvantages for individuals, society and national economies) and improve social cohesion. From an individual perspective, vocational education and training should develop young adults' vocational competencies, support their individual personality development and their integration into the labour market and society, help secure their livelihood and enable them to lead self-determined lives as citizens. Therefore, the assessment of competencies obtained in vocational education and training programmes has emerged as a critical issue to develop workforces and the capacity for life-long learning and to foster civic participation as a responsible citizen. This article provides some insights into the modelling and measurement of competencies in vocational education and training, where occupational and cross-occupational competencies are necessary to cope with the requirements of workplaces, as a responsible citizen and in private life. In this article, cross-occupational economic competencies and occupation-specific commercial competencies in the area of business and administration are discussed. Both constructs are based on economic theories, concepts and central terms; nevertheless, the situation-specific context and requirements may vary substantially. Thus, different approaches to define and measure both constructs seem to be necessary.