Twenty-eight Aboriginal health experts participated in two independent Delphi studies (n = 22 problem drinking study, n = 21 problem drug use; 15 participated in both). Panellists were presented with statements about possible first aid actions via online questionnaires and were encouraged to suggest additional actions not covered by the content. Statements were accepted for inclusion in the guidelines if they were endorsed by . 90 of panellists as either i??eEssentiali??f or i??eImportanti??f. At the end of the two Delphi studies, participants were asked to give feedback on the value of the project and their participation experience.