Table 2.

Operational definitions of the items measured on the yes/no checklist for skills in module 1

Skill #	Item #	Operational definition
1	1	3–6 items presented in a linear array.
1	2	Does not mix food items with toys in array
1	3	Allows only one item to be chosen at a time
1	4	Allows child to consume edible or allows access to item for 10 to 30 s
1	5	Removes each item from the array after it is chosen
1	6	Rotates item(s) after each choice
1	7	Ranks according to order that the child chooses (selects and consumes) item
2	8	Delivers preferred item(s) chosen in previous MSWO contingent upon appropriate play/vocalizations, eye contact with caregiver, or approaches to caregiver at least once. Withholds item if problem behavior occurs
2	9	Caregiver does not place any demands on the child during the pairing session
2	10	Names each item that is presented at least once