Every family whose child receives a diagnosis of a rheumatic disease (such as juvenile idiopathic arthritis (JIA), lupus, dermatomyositis and scleroderma) wants the best treatment and care. The doctors who treat your child also want to provide the best treatment and care for their patients. Over the past 20 years, new discoveries and medicines have greatly improved the lives of children with rheumatic diseases. Many new treatment choices are good, but how can we know which medication will work the best for each child? What if we can learn the answer to this question by simply collecting information on how usual care and treatment work for a lot of children with the same disease?