conducted a longitudinal study of development of offending and anti-social behaviour in 411 males who were studied from 8-50 years old
all living in deprived working-class areas of South London
41% convicted at least one offence between 10 and 50
7% defined as 'chronic' offenders as they committed half recorded offences
key risk factors - family criminality, poverty, poor parenting, low school achievement, risk taking
supports Sutherlands differential association theory, inappropriate role models lead to criminality