-Bowlby’s theory is based on association. Lewis analysed 500 interviews with young people, maternal deprivation was a poor predictor of future offending and the ability to form close relationships in adolescence. Even if there is a link there are countless other reasons for it, for example maternal deprivation may be due to growing up in poverty. This suggests that maternal deprivation may be one of the reasons for later offending behaviour, but not the only reason.