HarmVect is a tool simulating the introduction of arthropods into Belgium. An essential approach is the tool’s design in guiding the user to divide the complex arrival of the arthropod into all its potential pathways, which in their turn are further subdivided into individual pathway-segments. The manageable and singular pathway-segments are then used to specify which detailed data the user has to gather and feed to the tool. This information is used to simulate the magnitude of the arthropod population during the successive pathway-segments throughout each potential introduction pathway. The tool simulates the fluctuating propagule pressure throughout the successive segments of each pathway to calculate risk indices, which are then used to generate pathway risk maps of the arthropod for Belgium. The tool generates 2 types of pathway risk maps: (a) a Point-Of-Entry pathway risk map (POE) consisting of concentrated hotspots relating to the arthropod’s entry at the national borders, and (b) a Point-Of-Appearance pathway risk map (POA), successive to the POE and visualizing the locations and level at which undetected propagules of the arthropod are exposed to the outside environment throughout Belgium. In conclusion, the tool produces an establishment risk map for the arthropods, which is generated by combining the POA with a climate-suitability and host-availability map. ; This research was funded by the Belgian Federal Public Service of Health, Food Chain Safety and Environment (FPS-HFCSE) through the contract RT-13/5 HARMVECT