Empirical investigations of the extent and impact of multi-type maltreatment were identified. Data on the relationship between the different forms of maltreatment and the adjustment problems associated with each type of maltreatment were critiqued. As well as using dichotomous measures of maltreatment, an important methodological problem was the failure of researchers to assess all child maltreatment types, the relationship between multi-type maltreatment and adjustment, and the role of variables that influence the occurrence or impact of maltreatment. Considerable overlap was found in the occurrence of maltreatment types. The compounding or interacting effects of experiencing multi-type maltreatment were ignored in many studies. Where an assessment was made of the specific impact of multi-type maltreatment, it was associated with greater impairment than single forms of abuse or neglect. A multidimensional approach to prevention and treatment of child abuse and neglect is required in which children's vulnerability to multi-type maltreatment is addressed. 2 tables and 51 references