Inclusion Criteria:  children (5-18 years old) children with LUTS children who follow voiding school, with or without previously failed training  Exclusion Criteria:  children >18 years ol and <5 years old children who suffer from solely faecal problems without lower urinary tract symptoms children who are currently following a different kind of therapy concerning the LUTS, than VC children with neurological disorders or anatomical variations of the bladder children who underwent surgical intervention of the bladder