This study describes the behavioral repertoire of fourteen children, aged 4-12 years old, with cancer diagnoses, during a venepuncture procedure for chemotherapy, and of their caregivers and nursing assistants. Data collection was accomplished through direct observation with the use of the Observation Scale of Behavior Distress. Three systems of behavior categories were used (for children, caregivers and nursing assistants). There were no significant differences between concurrent and non-concurrent behaviors of preschool and school children. There was greater behavioral variability among caregivers of pre-school children and higher frequency of verbal behaviors directed to school children among nursing assistants. It is discussed the need of psychological preparation for invasive procedures in pediatric oncology.
