Elimination disorders are common in childhood and adolescence. Enuresis is defined as wetting from the age of 5 years and encopresis as soiling from 4 years onwards--after excluding organic causes. In the past few decades, many subtypes of elimination disorders have been identified with different symptoms, aetiologies and specific treatment options. The DSM-IV criteria no longer reflect this wealth of research data and a revision is needed. Classification systems of the International Children's Incontinence Society (ICCS) for enuresis and urinary incontinence and the ROME-III criteria for functional gastrointestinal disorders offer new and relevant suggestions for both clinical and research purposes. These are presented and discussed. Integration of these into DSM-5 is highly recommended.