SOLIDARITES INTERNATIONAL (SI) is an international humanitarian aid association which, since more than 40 years, has been providing assistance to populations affected by armed conflicts and natural disasters by meeting their basic needs for food, water and shelter. Particularly committed to the fight against diseases linked to unsafe water, the leading cause of death in the world, SI's interventions provide expertise in the field of access to drinking water, sanitation and hygiene promotion, but also in the essential area of food security and livelihoods. Present in some twenty countries, the SI teams 2500 people in total, made up of expatriates, national staff, permanent staff at HQ, and a few volunteers - intervene with professionalism and commitment while respecting cultural norms.