The research aims to assess the validity and reliability of the Motor Competence Assessment (MCA) instrument for 12-year-olds. The validity and reliability test provides a comprehensive framework for objectively measuring motor competence and identifying areas for intervention to enhance motor skill development. The study included 321 participants (156 male and 165 fe-male) from diverse Indonesian elementary school backgrounds. Motor competence assessment involved six test components, each conducted with two trials. Validity was assessed through exploratory factor analysis (EFA), and reliability was assessed via Cronbach's alpha, with raw data converted to a scale for EFA. The Kaiser-Meyer-Olkin (KMO) & Bartlett Test results and the Sampling Ade-quacy (MSA) measure are suitable for running EFA because they show more than 0.50. The standards for each item were met in the Communalities test by showing an extraction of >0.50 for each item. The MCA instrument proved valid because each test item (variable) firmly attaches to one instrument. Reliability tests, using Cronbach's Alpha, show that MCA instruments are reliable and usable. The Motor Competence Assessment (MCA) instrument demonstrates validity and reliability in measuring motor skills. Ex-ploratory factor analysis (EFA) identifies two main components: locomotor skills and stability and manipulative motor skills. Cronbach's alpha further confirms MCA's reliability. Its effectiveness in various contexts, including physical education and rehabilitation, supports targeted interventions. Understanding motor skill development with MCA enhances tailored approaches for individu-als, promoting physical well-being and performance. Keywords: physical education, motor skill, elementary school, assessment.