"Children with chronic illnesses have a doubled risk of developing psychosocial maladjustment--emotional problems, behavior disorder or difficulties in social relationships. Social work support and counselling aims to reduce this secondary morbidity, and is a common form of hospital-based psychosocial service. The first randomized controlled trial of this type of intervention was carried out to evaluate its effectiveness in treating and preventing maladjustment. This thesis describes how child behavior outcomes were assessed before and 4 months after a 6 month period of social worker assistance in 173 children randomized to intervention, and in 169 controls, all with chronic illnesses."--