For Aim 2—distinguishing skills in terms of their importance for collab- orative work—items were written to serve as exemplars of the eight skill and three non-skill categories identified from children’s verbal descriptions (attri- bute units). Multiple items were written for each category, and within a cat- egory, items depicted exemplars that were frequently cited in the open- ended interviews. This resulted in a total of 49 skill and non-skill items (see Table 1 for a listing of all descriptors).