 Recently a pictorial scale for measuring nausea, the Baxter Animated Retching Faces BARF scale, has been developed and shown to have construct, content and convergent validity as an instrument to measure nausea in children. The clinical usefulness of this scale in determining the incidence of postoperative and post-discharge nausea in children has yet to be determined including the lowest age where it can be used reliably, the score associated with a patients perception of a need for treatment, the minimum change in the scores of clinical relevance and the test-retest reliability when nausea is rated as not having changed. 