Continuous geodetic observations worldwide have played a fundamental role in the recent discovery of slow slip events throughout a wide variety of tectonic environments, including subduction zones, continental transform faults, and mid-ocean ridges. The recent proliferation of instrumentation has allowed these previously unrecognized phenomena to be observed over an increasingly wide range of temporal duration and throughout a diverse array of tectonic environments. There is now increasing evidence that transient fault slip commonly occurs over characteristic durations ranging from seconds to years. The fault regimes that permit slow slip to take place are not yet well-constrained, while its relationship to conventional seismicity remains an open question. This session invites contributions describing the latest progress and techniques in detecting, measuring and modelling of transient deformation in any tectonic environment with GPS, InSAR, strainmeters, and tiltmeters.