Background: Teaching and learning of nature of science (NOS) is an explicit goal in the core science curriculum in Norway. Yet there is little understanding of how the content of the current textbooks in certain educational pathways such as vocational training addresses NOS. Purpose: The aim of this study is to contribute to research on NOS in VET through exploring how the cognitive and epistemic aspects of NOS are addressed in end-of-chapter tasks in Norwegian science textbooks for vocational studies. Design and Methods: In this paper, we use a particular characterisation of NOS based on the Family Resemblance Approach (FRA) to investigate the cognitive-epistemic aspects of NOS in the science textbooks aimed at vocational education in Norway. The cognitive-epistemic aspects are about the aims and values, methods, practices, and knowledge in science. Three key textbooks have been selected and analysed with a focus on end-of-chapter tasks. Results: The results illustrate that NOS were almost absent in the tasks in all textbooks. Patterns across the coverage of NOS in the textbooks are discussed along with some implications for future studies.