Greulich (1957) compared physical growth and developmental status of 989 American born Japanese children (465 boys, 433 girls), aged 6 to 18 years living in San Francisco with children of the same age and sex born in Japan and found that Japanese children born in America were taller and heavier than children born in Japan. In India, Madhavan et al. (1964) carried out a cross-sectional study on 587 employees of railway work shop at Hyderabad to find out the secular changes in growth of Indian adults and found that younger generation is taller and heavier than the older generation. Tanner et al. (1966 a,b) provided the standards from birth to maturity of British children for their height, weight, height velocity and weight velocity.

Sample: To achieve these objectives, boys from the age groups of 12 and 13 years have been examined from the different regions of Punjab for the assessment of their developmental age.

Hypothesis: Developmental age as assessment of developmental age through morphological age is a valid and well established method.