A study with the aim of quantifying marula fruit yields in North-central Namibia, and to find correlations between tree size (trunk, canopy and height) and fruit yields was done in 2002. The fruits of 104 marula trees were weighed by community members, but in the final analysis only 56 of the data sets seemed reliable, and the rest of the data was discarded. It was furthermore said that the results of the study were not statistically valid because of the small size of the sample, the not random selection of the trees, and the late start of the survey, which excluded many of the trees that had already started to drop their fruits earlier in the season.