KMAN Publication Inc. International Journal of Sport Studies for Health 2588-5782 In Press 2027 01 01 Development and Initial Validation of a Sensor-Based Motor Tracking Device for Measuring Early Childhood Motor Skills Development and Initial Validation of a Sensor-Based Motor Tracking Device for Measuring Early Childhood Motor Skills 1 9 10.61838/kman.intjssh.5587 EN Journal Article 2026 06 04 <table> <tbody> <tr> <td> <p><strong>Objective:</strong> This study aimed to develop a prototype sensor-based motor tracking device and to conduct an initial expert-based validation for assessing early childhood motor skills.</p> <p><strong>Methods and Materials: </strong>This study employed a Research and Development (R&amp;D) design. Three experts in motor skills, media, and testing and measurement evaluated the prototype. The validation process was intended to identify the strengths and weaknesses of the product. After expert validation, a limited preliminary field trial was conducted with two children (one boy and one girl), aged 5-6 years, accompanied by their parents.</p> <p><strong>Findings: </strong>Expert appraisal produced feasibility ratings of 80%, 86%, and 83% for the media, motor skills, and testing and measurement domains, respectively. The overall expert-based feasibility score was 83.0 ± 3.0% (median = 83.0%; range = 80-86%), and all ratings were classified within the predefined valid category. A limited field trial involving two children aged 5-6 years confirmed basic implementation feasibility. These findings support preliminary expert-based feasibility but do not establish full psychometric validity, reliability, measurement accuracy, or criterion validity.</p> <p><strong>Conclusion:</strong> The prototype showed preliminary feasibility for early childhood motor skill assessment based on expert appraisal and limited field implementation. The evidence remains early-stage, and larger validation studies are required to determine reliability, criterion validity, measurement error, sensitivity, specificity, calibration accuracy, and agreement with standardized instruments such as TGMD-3 and MABC-2 before routine use can be recommended.</p> </td> </tr> </tbody> </table> https://www.journals.kmanpub.com/index.php/Intjssh/article/download/5587/11919