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This study developed and validified the Behavior Development Screening for Toddlers-Questionnaire/ Parents (BeDevel-Q/P), an autism spectrum disorder (ASD) screening instrument. This assessment serves the purpose of parental reports for early screening of ASD on infants aged 9-47 months. 565 preliminary questionnaires were generated based on prior studies of ASD infants and parents. After Context Validity tests of interdisciplinary ASD experts, Face Validity tests of parents with ASD children, and preliminary research, 51 questionnaires were created. Pilot tests were conducted on a total of 289 people (N = 196 typical development, N = 43 ASD, N = 51 developmentally delayed). A total of 2273 participants were tested N = 1918 typical development, N = 221 ASD, N = 134 developmentally delayed). The results showed a line between age ranges of 9-11 months, 12-23 months, 24-35 months and 36-47 months. Each age ranges consisted of 10-28 questionnaires and 3 subfactors. BeDevel-Q/P validity was tested by the general developmental criterion of BeDevel-Q/P, M-CHAT, Q-CHAT-10, ADOS-2, K-CARS and CBCL 1.5-5 DSM pervasive developmental problems. Autism items from BITSEA were also employed and correlation analysis was performed on sociability items from K-DST, and general differentiation factors between ASD, developmental delayed, and normal groups were also considered. Results showed a reasonable level of acceptability. BeDevel-Q/P showed high sensitivity (78.5-84.0%), specificity (81.0-82.0%), high internal consistency (Cronbach’s α=0.85-88) as well as high test-retest reliability (r=0.712-980). Lastly, the significance and limitations of this study and directions for future research is suggested.
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