The conceptual mastery of the work process and its improvement in the pulp and paper industry has been studied in several mills. Development programs based on systematic analysis and modeling of the work process have been used to improve the work process and the workers’ conceptual mastery of it. The participants in the programs have made dozens or even hundreds of concrete proposals to improve the actual work processes and their conceptual mastery of the work process has increased. The results also suggest that conceptual mastery of the work process can be a source of positive well-being. This connection can happen during the development process showing that knowledge of the work process is really valued in the organization.