This document summarizes a panel discussion on the use of inverse modeling and uncertainty quantification in groundwater modeling. [1] Inverse modeling methods have been developed since the 1980s but are not yet standard practice, with only 20-50% of modelers reported to use them. [2] While inverse methods provide better model calibration, uncertainty quantification is also not widely used in practice unless specifically required by regulators. [3] Routine use of these techniques is unlikely without explicit requirements, as there is always a gap between theoretical development and real-world application where solutions must have clear problems to solve.