<unk>  is the manifestation of psychological disorders in<unk> ren and adolescents. Oppositional defiant disorder, attention-deficit hyperactivity disorder, and pervasive developmental disorder are examples of<unk> . Social workers, psychologists and psychiatrists who work with mentally ill<unk> ren are informed by research in developmental psychology, developmental<unk> , clinical<unk>  psychology, and family systems.
The current trend in the U.S. is to understand<unk>  from a systems based perspective called developmental<unk> . Recent emphasis has also been on understanding psychological disorders from a relational perspective with attention also given to neurobiology.
Research and clinical work on<unk>  tends to fall under several main areas: etiology, epidemiology, diagnosis,  assessment, and treatment.
Child psychopathology
Neurodevelopmental disorders
Child development
Developmental disability
Prenatal development
Pre- and perinatal psychology
Learning problems in childhood cancer
Autism causes