4. to identify medical (steroid use, use of disease modifying agents such as cytoxan, cellcept, thalidomide, or cyclosporine, disease duration, disease activity and disease damage etc.) and psychosocial (self-concept, socioeconomic status) factors that affect HRQOL (as measured by child- and parent-reports of SMILEY© and PedsQL generic and rheumatology modules) and physical function 5) to translate, adapt and validate SMILEY in different languages