PurposeThe aim of the article is to propose an integrated definition of knowledge-intensive business processes (kiBPs) and a model of business process (BP) knowledge intensity and develop holistic criteria and measures for the assessment of BP knowledge intensity.Design/methodology/approachA qualitative systematic literature review (SLR) was carried out as a means of evaluating and interpreting all available research relevant to the research topic, in this case, BP knowledge intensity. The SLR is based on the resources of the ProQuest, Springer Nature and ScienceDirect full-text databases. Regarding inclusion criteria, the authors considered peer-reviewed journals and conference proceedings published in English in the last 10 years. The results were summarized and synthesized narratively.FindingsBased on the review, the authors classified existing knowledge intensity definitions, starting with knowledge-intensive economy or country, sectors and services, through knowledge-intensive organizations, BPs, to tasks. Then, an integrated definition of kiBPs was proposed and the business process knowledge intensity model encompassing three domains developed. Finally, 12 knowledge intensity criteria with measures were proposed.Originality/valueThe major value of this research is that it presents a novel approach to understanding BP knowledge intensity and kiBPs. By creating the BP knowledge intensity model, supplemented by the assessment criteria and measures, the authors contribute to the more effective management of kiBP, help find similarities and differences between various knowledge-intensive processes, as well as provide important implications for their effective management and research.