The archaeological community is currently facing many ethical issues in its daily practice. The Archaeo-Ethics Symposium of 25-26 May 2018 provides an overview of this difficult subject. During the symposium, the constraints of contexts of intervention (armed conflicts, dictatorships, funeral archaeology), economic constraints (archaeological regulations and competition) as well as social constraints (between archaeologists and indigenous or local populations, as well as between professional and amateur archaeologists) were brought up. Among the discussions, the seminar “Professionals, Volunteers, Amateurs and Citizens: Research Actors for What Contributions?” proposes to revisit the contributions of non-professionals in order to consider solutions conducive to a redesign of relations between professional and non-professional actors. Objective: to improve heritage preservation while achieving quality results.