In this article, we attempt to analyze the relationships among delinquent development, school problems and family background under achievement society. Then, we researched into 520 delinquent boys who were born in 1960 and arrested by police at 14 years of age in Aichi prefecture in 1974.
We adopted the number of offense known to the police from 14 years to 19 years as an index of the delinquent development and also adopted the following two factors as indices of school problems; 1) school achievement under 14 years 2) entrance to senior high school or drop out from senior high school. We adopted another two factors as indices of family backgrounds; 1) economic conditions of family 2) conditions of parent (broken or natural home) and finally adopted the number of guidance by police as an index of delinquent tendency before 13 years.
520 juvenile delinquents were divided into two groups according to their deliquent conducts. One is property offense type delinquents and another is bodily injury type delinquents. Then, tabular analysis, correlation analysis and path analysis were made on each group.
The main results are as follows; 1) Among 520 juvenile delinquents, 209 delinquents were arrested by the police on a charge of subsequent delinquency by 19 years. The rate of repeated delinquents is 40. 2 percent.
2) Among the indices mentiond above of juvenile delinquents, delinquent tendency exerts most direct effects on delinquent development. Path coefficient of property offense type delinquents is. 332 that of bodily injury type delinquents is. 606 for the number of offenses repeated.
3) Comparing indices of school problems with family backgrounds, the entrance to senior high school or drop out from senior high school exerts most direct effects on delinquent development among property offense type delinquents (path coefficient=.188).
As a result of path analysis, we found the sequence of indices having theeffects on delinquent development for the property offense type delinquents; poor economic condition of family poor school achievement not entrance to senior high school or drop out from senior high school subsequent offenses repeated
4) Among bodily injury type delinquents, poor school achievement exerts most direct effects on delinquent development (path coefficient=.231).
We also found the sequence of indices among bodily injury type delinquents having the effects on delinquent development. poor economic condition of family poor school achievement subsequent offenses repeated
