The present literature review brings together the latest research-based evidence and knowledge in the international research literature in the field on how RTOs' technological ser-vice advice and infrastructure affect firms’ financial performance, how they contribute to firms’ innovation processes and innovation capacity, and their significance to firms’ subsequent col-laboration with knowledge institutions and others. The focus is primarily on GTS-like RTOs1 to increase the applicability of the review in a Danish context, including giving the Danish Agency for Higher Education and Science (UFS) a knowledge base on RTOs’ significance for Danish firms. An overview table in the appendix summarizes the identified literature, giving references, short summaries and categorizations about, e.g. empirical methods and data, its coverage and placement in our evidence hierarchy.