Phonology refers to the patterns of sound production, and phonological disorders refer to simplification strategies that children use to make speech production easier. For example, if a child produces ‘toot’ for ‘cook’ or ‘dum’ for ‘gum’, he/she is ‘fronting’ the sound. The phonological process of ‘fronting’ means that the child is consistently substituting a ‘back sound’ (sound is produced in the back of the mouth) with a ‘front sound’ (sound is produced in the front of the mouth). Phonological processing errors can contribute greatly to reduced intelligibility of speech if not corrected by a developmentally appropriate age.