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The purpose of this study was to compare the skeletal ages and various physical and motor factors with the pubescent development of 10, 13, and 16 year old boys. The findings of this study indicated that physical maturation was differentiated most effectively at 13 years of age, although it was not so sensitive to maturational changes as was skeletal age; at 16 years, maturational differentiation was much more limited; and at 10 years, little or no value can be attributed to this method. The 13 and 16 year old boys who were advanced in pubescent development had higher mean scores on all physical and motor tests studied with few exceptions; generally, the differences between the means were significant. In terms of physique types, the only significant difference was found at 16 years of age, where a greater percentage of ectomorphs was found in pubescent group 4 than in group 5. THE PURPOSE of this study was to compare skeletal ages and various physical and motor factors with the pubescent development of 10, 13, and 16 year old boys. In order to accomplish the purpose of this study, answers to the following three questions were sought :1. How effective is pubescent assessment in determining physical maturation as contrasted with skeletal age for boys at the ages studied? 2. Do boys who are advanced in pubescent development at a given chronological age have higher mean scores on anthropometric, strength, and motor tests than do boys who are retarded in their pubescent development? 3. For the same age, are significant differences in physique types of boys found among those who differ in pubescent development? Boys 10, 13, mid 16 years of age were chosen for study since they span the pubescent period i i i the Eollowinp respects: At 10 years of age, most boys are prepubescent, ant1 their extet nu1 sexual chnrac.teristic-s are mostly immature.

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