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Purpose The present study investigated the dimensionality and homogeneity of motor competence, which is defined as the ability that underlies the performance of a wide variety of motor skills, in early childhood using a large set of items. Method A total of 1467 children (aged 3–6 years) were measured with the Motor Proficiency Test for 4-to 6-Year-old Children (Motoriktest für vier-bis sechsjährige Kinder [MOT 4-6]), which consists of 17 items. Results Analyses using the Partial Credit Model and mixed Rasch model revealed a one-dimensional structure (CR= 1.964, p CR=. 06; P-χ 2=−. 227, p p-χ 2=. 24). Due to unordered threshold parameters, five items were excluded. These items have a scoring system that counts the amount of successful trials (0–2). Conclusion The study shows item and person homogeneity within a validated motor score, using 12 items of the MOT 4-6. Thus, it provides evidence of a single …