This study describes a method of project-based learning applicable in work organizations. The essence of this method lies in the connection of learning and working in group projects, fine-tuned to the needs of the participants and to the possibilities offered by the organization. The method is conceptually underpinned by the learning-network theory. Following an overview of the characteristics of the project-based learning method, a comparison is made with other action-based methods. An empirical illustration is provided by a discussion of four learning projects conducted in regional probation institutions, which are found to differ from each other in several respects. It is concluded that the project-based learning method can yield a surplus value compared to more traditional types of education and training. It also makes higher demands, however, on the learning and work systems of the organization and on the involvement of the learners.