To examine the psychometric properties of a brief quality of life (QOL) instrument for use in pediatric systemic lupus erythematosus (SLE). The purpose of this prospective study is primarily to determine the validity and reliability of a new health-related quality of life (HRQOL) measure in children with systemic lupus erythematous (SLE). We wish to secondarily examine concordance between child- and parent-reports of the HRQOL measure and identify factors associated with poorer HRQOL in them.