The main objective of the current study was to examine the impact of two child risk factors, i.e. personality and inhibition, and two proximal family risk factors, i.e. parenting and attachment, and the impact of their cumulative effect on later externalizing behavior among young children incurring no distal family risk. Data were collected in a longitudinal two-wave design from 161 non-referred and referred children aged three to five years at the onset of the study. All of the children were raised in families of middle to high socio-economic status, i.e. their parents were educated to a middle to high level, had access to the job market and lived together as couples. The four risk domains were assessed at the onset of the study, while EB was rated both at the onset of the study and in the 24-month follow-up. Results confirmed that the four risk domains were each both correlates of EB and efficient at discriminating non-referred from referred children; that their combination regardless of their content (cumulative risk) provided a strong prediction of both later EB and non-referred vs referred sample membership. The results are discussed both for research and clinical purposes.
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