Table 3.

Operational definitions of the items measured on the Yes/No checklist for skills in module 2

Skill #	Item #	Operational definition
3a	11	Places at least one preferred item within the child’s reach
3a	12	Identifies when MO is present. Waits for child to look at item, approach, or reach for item before delivering item
3b	13	Engages with preferred item(s)
3b	14	Identifies when MO is present. Waits for child to look at, approach, or reach for item before delivering item
4	15	Holds preferred item in view of child and does not provide any verbal prompts
4	16	Waits approximately 5 s for a response. Delivers item following appropriate response or after the 5-s elapses (non-contingent)
4	17	Records the first probe data correctly