Great question! We do generally recommended that users score these items in the same manner as the other item scores (total score achieved/total score possible). There are other versions of these items that use different scoring methodologies, but scoring procedures are tied to the specifics of how an item was administered (for example, see Cameron, McClelland, Matthews, & Morrison (2009) on the scoring for the original head-shoulders-knees-toes item from which ours was adapted).

If desired, you could combine the two scores into one ‘executive function’ score. However, take care to note that two items are not enough to represent the entire domain of executive functioning. We are hoping to add more items to this domain in the future so that it more completely represents this domain of development so stay tuned for more on this!