In November 2004, IRDNC started the investigation into the perfume plants used by the Himba people in Namibia's Kunene Region. During 2005 and 2006, PRA activities, vegetation mapping, vegetation transects, a questionnaire survey and trial harvests, indicated that omumbiri (Commiphora wildii) was the most important resin producing plant used by the Himba women for perfume. This work also indicated that the use of resin was sustainable since only resin that is naturally exuded from the tree is harvested. Further work in the 2006/2007 harvest season, estimated that about 50 tons of resin is produced every year in the five conservancies involved in this investigation - Puros, Orupembe, Marienfluss, Sanitatas and Okondjombo.