Eleven is a difficult age for most children because they move from enthusiastically embracing the joys, challenges, and excitement of childhood. Important developmental processes are continuing to take place in the eleven-year-old's brain. At this age, physical growth and development is very different for girls and boys. This age children experience more minor illnesses, such as colds, flu, and ear infections. At the age of eleven, children are in midst of marked improvement in complex cognitive functioning. They are between childhood and adolescence, and, because of biological changes, are beginning to experience new emotions and feelings. Many eleven-year-olds may be more technologically savvy than their parents. Child-centered activity play therapy (CCAPT) can be an effective intervention for them. Adlerian play therapy (AdPT) is another intervention that can be useful for this age children and can be implemented in an activity room. Group activity therapy is one intervention that targets eleven-year-olds with difficulty in interpersonal relationships, whether with siblings or peers.