The IAG's Global Geodetic Observing System (GGOS) provides the means for integrating ground- and space-based geodetic and gravimetric observations. Modernizing the existing geodetic and gravimetric infrastructure homogenizing the processing of data are essential for consistent observations of Earth's time-variable shape, rotation, and gravity. This session is a forum for discussing ongoing and planned improvements to the geodetic and gravimetric observing systems and for using the observations from those systems to improve our understanding of the dynamic Earth. We particularly welcome contributions on the observation and determination of essential geodetic variables, including essential variables for global climate and ocean studies. We also welcome general contributions on GGOS including the progress and plans for building next generation geodetic and gravimetric stations.