Figure 6.10 shows the misgrouping rates that occurred for each participant in the user testing. As a percentage of the total number of characters written by the users, there was an overall misgrouping rate of 13%.
If the strokes of two symbols are misgrouped as belonging to one symbol, it is counted as one misgrouping error because it takes one regroup stroke in modify stroke groups mode to correct it. In other words, the number of regrouping strokes made were counted.