Currently invasive alien plants in Namibia and Germany are regarded as of moderate importance. But without proper monitoring and awareness the situation could change quickly and dramatically. One option to estimate possible distributions of species is by using species distribution modelling. My master's thesis will deal with the possible and potential distribution of four invasive alien plant taxa (Prosopis spp & Leucaena leucocephala in Namibia; Prunus serotina & Robinia pseudoacacia in Germany) as calculated using the programme Maxent. A comparison between the ranges from native occurrence data (North-America) and actual occurrence points in the receiver country in relation to the environmental setting will be done. The occurrence points were extracted from international databases (e.g. GBIF) and national herbaria (e.g. WIND).