This study explores the effectiveness of two intervention programs: "Long-distance developmental behavioral intervention" and "developmental behavioral interventions" for children with autism spectrum disorder or multiple developmental delays.

Inclusion Criteria:

• Child's age between 30-84 months old.
• Children have a diagnosis of autism spectrum disorder or multiple developmental delays.
• Children without physical disabilities or major health problems, such as congenital limb defects.
• One of the fathers or mothers involved in the study shall be the primary caregiver of the child.
• The father or mother participating in the study has at least 9 education years and can read and understand Chinese.
• The father or mother participating in the study is willing to allow the child to undergo a comprehensive development assessment and is willing to video during the training process.

Exclusion Criteria:

• Absence of chromosome abnormalities, congenital anomalies, and major neurological or sensory impairments or disorders (e.g., cerebral palsy, microcephalus, macrocephalus, severe brain damage, uncorrected vision, or hearing loss).