The development of self-management skills by adolescents with myelomeningocele is an ongoing process. Previous studies lack consensus about what data can be accurately obtained from adolescents. This cross-sectional study using a convenience sample of 66 adolescent–parent dyads evaluated whether adolescents with myelomeningocele and their parents are interchangeable reporters of data. Adolescents' ages ranged from 12 to 21 years with a mean of 16 years 2 months (SD 2y 8mo); 38 were female, 28 were male; 30% had thoracic lesions, 32% had lumbar lesions, 15% had lumbosacral lesions, 23% had sacral lesions, and 85% had ventriculoperitoneal shunts. In this analysis, participants reported activities (decision-making, household responsibility, and friendship activities) and select outcomes (functional status, self-management, and social competence) similarly. However, differences emerged in reports of beliefs (adolescent future expectations, family variables) and select developmental competencies (school, job, athletic, behavioral, attractiveness, and romantic appeal). Analysis using t-test and interclass correlations supported a pattern of adolescent–parent agreement in areas of observable behavior and differences in more subjective domains such as perception of developmental competencies.