The RI-PATHS team has developed a working note on a functional taxonomy of research infrastructures (RIs) that will form a basis for the development of the impact assessment model. The working note, available here, proposes a classification that distinguishes between RIs that carry out research (basic, use-inspired and applied research) and those that deliver research-oriented services. Such a taxonomy can be applied to explain the various ways in which an investment in or funding of RIs generates and contributes to socio-economic outcomes. In line with the RI-PATHS aim to develop an operational IA model, the taxonomy will be tested on real cases before final validation. If you wish to provide any feedback, please contact us at firstname.lastname@example.org.