The conundrum remains. Standardization will halt progress, but without it, training becomes difficult. The issue is already apparent in basic airplanes such as the Cessna singles, where there are more than one version of the G1000 integrated avionics system. These are airplanes three years old or less, but it is impossible to generalize about exactly how to operate the avionics in a 182, for example. And new software versions will come along regularly, some to resolve issues found in service and others to enhance capability. From the outside the boxes will look the same, but can have subtle operating differences.