The German versions of the two questionnaires 'Functional Mobility Scale' (FMS) and 'Gillette Functional Assessment Questionnaire - walking scale' (GFAQ) are evaluated in terms of construct validity, inter- and intra-rater reliability as well as responsiveness in children with a neuromuscular diagnosis, who absolve an inpatient stay in the rehabilitation center of the University Chilren's Hospital Zurich, Switzerland.