Table 2.

Content Validity Ratios for Intervention Taxonomy Items

Item		Essential or Useful	Essential
1	Face-to-face and on the child’s level *	0.89	0.68
2	Preparing the activity space	0.89	0.37
3	Following the child’s lead *	0.89	0.89
4	Imitating the child	0.37	0.05
5	Supporting turn-taking	0.79	0.26
6	Displaying positive affect and animation *	1.00	0.68
7	Engaging the child in play routines	0.79	0.16
8	Engaging the child in social routines	0.79	−0.37
9	Managing problem behavior and dysregulation	1.00	0.37
10	Modeling appropriate language *	1.00	0.58
11	Modeling gestures and JA	0.47	0.05
12	Modeling new play acts	0.79	0.37
13	Responding to attempts to communicate *	0.89	0.89
14	Using communicative temptations *	1.00	0.79
15	Pace and frequency of direct teaching opportunities *	0.89	0.58
16	Varying difficulty of direct teaching target	0.68	0.05
17	Using clear and appropriate teaching opportunities *	0.79	0.79
18	Providing motivating and relevant teaching opportunities *	1.00	1.00
19	Supporting a correct response using prompts *	0.68	0.37
20	Providing contingent natural and social reinforcement *	0.89	0.79

Note.

^*denotes items included in the NDBI-Fi Measure; Bold text denotes items exceeding the statistically significant cutoff of 0.42.