<![CDATA[Number understanding is an important foundation for mathematical learning among children with autism, yet assessment practices may not always provide structured, consistent, and individualized information about their number sense abilities. This study aimed to develop a digital assessment instrument for identifying the number sense abilities of children with autism at Alazka Kids Development Surabaya. The study employed a research and development approach using the 4D model, consisting of define, design, develop, and disseminate stages. The development process focused on four indicators of number sense: subitizing, number-symbol recognition, one-to-one correspondence, and magnitude or quantity comparison. The digital assessment was designed with an autism-friendly interface characterized by simple visual displays, structured stimuli, one instruction per screen, touch-based interaction, and limited visual and auditory distractions. The system also provides automatic recording of response accuracy and response time to support individual assessment profiles. The resulting product is intended to assist teachers and therapists in identifying children's number sense needs and supporting individualized learning programs. Further research with complete validation, practicality, and effectiveness data and broader participants is needed to establish its reliability and educational impact.]]>
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