Will help in designing proper observatory configurations, instrument characteristics and data acquisition schemes during the entire period of the project. Gabriele Marquart and Harro Schmeling are leading a large innovative project for modelling the Iceland Hotspot, and will base their designing work for the system on that ongoing work, and on previous ground deformation work. Besides advices in designing observatory configurations, networking and demonstration of the capability of the evolving HOTSPOT infrastructure among end users are significant tasks of WP 4.