On 04 September 2024 a SPWLA Hydrocarbon Resources Special Interest Group presentation and discussion was held regarding the quantification of the effect on subsurface 3D positional uncertainty on reserves calcualtion. The effect of managing 3D positional uncertainty on reserves calcualtions, and the model for quantifying this, was dicussed. This model is also outlined in the book "Subsurface 3D Positioning and Positional Uncertainty, Rev 7.0".