This paper describes ongoing research focusing on how vocational learning content in different technical vocational programmes in upper secondary schools is taught and learned in close interaction in the midst of practical learning situations. The study shows that the technical vocational learning content have some aspects in common – such as the interplay between theoretical and practical knowledge, the use of working tools, the problem solving and the complexity of interacting critical aspects. However, there are also differences between the learning content in the teaching of different vocational subjects, in relation to working methods and the nature of the objects of learning. Still, more studies are needed in order to claim that the differences are subject specific. Furthermore, the study shows that teachers often aimed to teach the learning content in a broad perspective, which could be at the expense of a clear focus for the student. In one of the studied programmes an intervention study was conducted. This study shows that an enhanced focus on fewer, specific critical aspects of the object of learning might support the learning process.