The search and selection strategy described in the methods section identified 12 sources (Table ) along with their title, year, DOI and primary use case. Two minimum reporting standards were identified from organizations: the International Organization for Standardization (ISO) and the United Nations (UN). Moreover, two minimum reporting criteria were part of deliverables for EU nanosafety projects, namely, RiskGONE and caLIBRAte . The table shows the number of extracted variables from each source and for which maturity indicators were created. In total, 281 maturity indicators were created belonging to the 12 identified MRS lists.