Relations between Multi-Dimensional Measurements of Development and The Independence Level of Each Age in Life-Span Development

Abstract

In the previous research developmental change in various functions of infants and children were examined. But there were few available data about developmental change in those functions of the adult period. Therefore, this investigation was designed to examine those problems. College student subjects were asked to evaluate 20 items to see to what degree 1 year old, 3 year old, 5 year old, 10 year old, 20 year old, 40 year old, 60 year old and 80 year old people would be able to perform independently and adequately. The mean value of the 20 items increased when the age rises from 1 years old to 20 years old. The mean value of all items became the highest at 20 years old or 40 years old. For 60 years old and 80 years old, the mean value of all items decreased more than the mean value of 40 years old. Correlations with representative values calculated by different method (mean, max, min, etc.) of 5 item-groups and the independence level in each age are compared and discussed.