The psychometric characteristics of the Faces Pain Scale (FPS) were evaluated in three groups of preschool and school-aged children (3.5–4.5; 4.5–5.5 and 5.5–6.5 years, respectively). The FPS was adequately comprehended by even young children. It was easily administered and was valid and discriminating. It did not, however, possess the linear scalability claimed by its authors.
