Table 1.

Mean CVI (max. 1.00), and mean values (max. 3.00) of experts’ ratings on relevance for subdomains to their domain within parenthesis

Domain	Subdomain	Items	CVI subdomains relevance (and M)	CVI item clarity (and M)	CVI item comprehensiveness (and M)
Total scores		1–56	.99 (2.88)	.98 (2.78)	.97 (2.82)
Learning environments		1–8	.98 (2.84)	.96 (2.57)	.95 (2.66)
	Safety	1–2	.89 (2.67)	.89 (2.44)	1.00 (2.61)
	Organization of Learning Environment	3–4	1.00 (2.56)	.95 (2.44)	.95 (2.56)
	Materials	5–6	1.00 (3.00)	.95 (2.61)	.95 (2.78)
	Visual schedules	7	1.00 (3.00)	1.00 (2.89)	1.00 (3.00)
	Transitions	8	1.00 (3.00)	1.00 (2.67)	.78 (2.33)
Positive learning climate		9–12	1.00 (2.89)	1.00 (2.92)	1.00 (2.89)
	Staff-student interaction	9–10	1.00 (2.89)	1.00 (3.00)	1.00 (2.95)
	Staff behaviors	11	1.00 (3.00)	1.00 (2.78)	1.00 (2.78)
	Promoting diversity	12	1.00 (2.78)	1.00 (2.89)	1.00 (2.89)
Assessment and IEP development		13–18	.95 (2.75)	1.00 (2.74)	.93 (2.81)
	Assessing student progress	13	.89 (2.78)	1.00 (2.33)	.89 (2.56)
	Assessment process	14	.89 (2.67)	1.00 (2.89)	.89 (2.78)
	IEP goals	15–17	1.00 (2.78)	1.00 (2.89)	1.00 (2.93)
	Transition planning	18	1.00 (2.78)	1.00 (2.56)	1.00 (2.78)
Curriculum and instruction		19–30	1.00 (3.00)	.98 (2.80)	.96 (2.81)
	Classroom instruction	19–30	1.00 (3.00)	.98 (2.80)	.96 (2.81)
Communication		31–34	1.00 (3.00)	1.00 (2.89)	.97 (2.94)
	Communication rich environment	31	1.00 (3.00)	1.00 (3.00)	1.00 (3.00)
	Individualized communication instruction	32	1.00 (3.00)	1.00 (2.89)	1.00 (3.00)
	Responsiveness to student communication	33	1.00 (3.00)	1.00 (2.78)	.89 (2.78)
	Communication systems	34	1.00 (3.00)	1.00 (2.89)	1.00 (3.00)
Social competence		35–38	1.00 (2.89)	1.00 (2.83)	1.00 (2.94)
	Arranging opportunities	35–36	1.00 (2.89)	1.00 (2.83)	1.00 (3.00)
	Teaching and modeling	37	1.00 (3.00)	1.00 (2.78)	1.00 (2.78)
	Peer social networks	38	1.00 (2.78)	1.00 (2.89)	1.00 (3.00)
Personal independence and competence		39–41	1.00 (2.78)	1.00 (2.89)	1.00 (2.85)
	Personal independence	39–40	1.00 (2.89)	1.00 (2.94)	1.00 (2.94)
	Self-management	41	1.00 (2.67)	1.00 (2.78)	1.00 (2.67)
Functional behavior (interfering and adaptive)		42–46	1.00 (2.94)	.93 (2.67)	.93 (2.73)
	Proactive strategies	42	1.00 (3.00)	.89 (2.67)	.78 (2.44)
	Behavioral assessment	43–44	1.00 (2.89)	.95 (2.72)	.95 (2.72)
	Behavior management	45	1.00 (3.00)	.89 (2.33)	1.00 (2.89)
	Data collection	46	1.00 (2.89)	1.00 (2.89)	1.00 (2.89)
Family involvement		47–49	1.00 (2.96)	1.00 (2.85)	1.00 (2.96)
	Teaming	47	1.00 (3.00)	1.00 (2.78)	1.00 (2.89)
	Communication	48	1.00 (3.00)	1.00 (2.89)	1.00 (3.00)
	Parent teacher meetings	49	1.00 (2.89)	1.00 (2.89)	1.00 (3.00)
Teaming		50–56	1.00 (2.88)	1.00 (2.83)	1.00 (2.83)
	Team training	50	1.00 (2.67)	1.00 (2.44)	1.00 (3.00)
	Team membership	51–53	1.00 (2.89)	1.00 (2.93)	1.00 (2.89)
	Team meetings	54–55	1.00 (2.89)	1.00 (2.94)	1.00 (3.00)
	Implementation	56	1.00 (2.78)	1.00 (2.67)	1.00 (2.67)

Mean CVI, (max. 1.00) and mean values (max. 3.00) of the clarity and comprehensiveness of items aggregated to subdomain and domain level within parenthesis. M = mean