This project is to develop a new CMT Pediatric Scale (CMTPeds) for Children with CMT. Although there is a validated score (the CMTNS) which measures disease severity for CMT, it is not always applicable to children due to their limited ability to relay information about their symptoms. The CMTPeds scale is being developed and validated in order to measure disease severity in children and have outcome measures available for future clinical trials. Children (defined as 21 and under) being evaluated will be asked to perform functional tasks such as using stairs, walking in a hallway, and performing hand function tests. This information will be used to validate the CMTPeds score. It is important to have validated instruments to measure disease severity in childhood so these can be used with clinical treatment trials are available.