Main objectives are the fundamental understanding of radio nuclide migration processes in the geosphere, the application to performance assessment and communication of the results. The project tackles one of the main challenges for a sustainable European energy mix, namely scientific and social credibility of geological HLNW disposal. Fundamental processes are studied in two RTDCs, covering key radionuclide transport and retardation processes at the molecular level. This molecular level understanding is moved forward into studies on the host rocks being considered in Europe (clay, granite, salt). In three host-rock specific RTDCs, migration processes are studied at scales of interest for the performance assessment (PA). Spatial scales reach from nanometres to kilometres and time-scales from laboratory to geological systems. Integration and abstraction to PA are key issues. The scientific and technological knowledge gained in the project will improve the state of the art of PA abstraction and visualisation methodologies. The knowledge acquired throughout the project is brought forward to the general scientific community and broader stakeholder communities by active training, knowledge transfer and dissemination. The IP FUNMIG is innovative in the scientific approach to the fundamentals of radionuclide migration processes, where cutting-edge analytical and spectroscopic techniques are combined with advanced molecular and numerical modeling. The process of up-scaling methodology proposed in the host rock components is extremely innovative and tackles highly fundamental scientific challenges. The 48 contractors Project Consortium include Research Institutes, Universities and SMEs. The participation and strong financial commitment of Waste Management Agencies ensures proper technology transfer and application feedback. Active technology transfer and training is ensured, also by involvement of additional associated groups interested in the subjects.