To obtain the first piece of information, we need to determine the size and shape of a VFZ. To obtain the second piece of information, we need to determine the distance over which the property of interest is correlated. If the crystallographic distance between nearest neighbors (NNs) in a collection of GBs is larger than the correlation length, then there will be large gaps between points where predictions/interpolation will be unreliable. If, on the other hand, the NN distances are smaller than the correlation length, then predictions between the measured/calculated values can be expected to be reasonable. Finally, estimates of uncertainty can be obtained by comparing the distribution of repeated measurements. We use VFZ-GBOs to explore structure-property relations in the 5DOF space of GBs. To make our aims more complete, we summarize these points in the following questions: