Session I Theory and realization of global terrestrial reference systems.- Session II Strengths, weaknesses, modelling standards and processing strategies of space geodetic techniques.- Session III Definition, establishment, maintenance and integration of regional reference Frames.- Session IV Interaction between the celestial and the terrestrial reference frames.- Session V Definition and establishment of vertical reference systems.- Session VI Usage and applications of reference frames in Geosciences.- Session VI Usage and applications of reference frames in Geosciences.