B.USOC, the Belgian User Support and Operations Centre, is the centre responsible for the operations of ESA's SOLAR payload, which is externally accommodated on the Columbus Module and has been operating continuously since February 2008. The B.USOC operators, as all ISS ground Support Personnel have successfully followed the specific training and certification programme which guarantee the operational safety and mission success to the maximum extent. This certification programme mainly consists of the internal qualification and the successful participation of a number of European Simulations (ES) and Joint Multi-Segment Trainings (JMST), organized by ESA/EAC and NASA, respectively. The certification permits operators to execute on-console operations on a specific payload. However, a long-term and complex mission like SOLAR calls for additional, payload specific training. The B.USOC has set up an internal qualification programme for future SOLAR operators. The already certified operators receive continuous training through refresher sessions, optimisation boards, operations tools, and practical exercises. Especially during long-term missions, where payload operations are optimized continuously and become routine, the acquired skills and knowledge of the operators need to be maintained at a high level in order to achieve a successful mission.