1. When reporting specific capacitance, one should always make sure to clarify whether it is the specific capacitance of the electrode material in a two-electrode cell, or the specific capacitance of the electrode material independent of device architecture (a "pseudo" single electrode measurement). This recommendation was suggested by several participating groups in this study. 2. For devices displaying non-ideal behaviour, other performance metrics, such as capacity and discharge energy, need to be calculated and reported alongside any average capacitance values . 3. When using GCD datasets to calculate capacitance, the voltage range used to calculate the discharge slope should be reported, and the Ohmic voltage drop should be excluded from this calculation. 4. Where possible, GCD datasets should be used to calculate metrics instead of CV datasets. 5. Agreement and application of consistent criteria are necessary for accurate determination of the Ohmic voltage drop in GCD experiments.