Phonology refers to the rules that govern the sound system of a language, including how speech sounds are organized, combined, and used for meaningful communication (ASHA, 2023a). A phonological disorder occurs when a child uses predictable patterns of sound errors that affect multiple sounds or classes of sounds, even if they can say individual sounds correctly in other contexts.
Examples of phonological patterns include:
- Fronting – “tat” for “cat”
- Stopping – “tun” for “sun”
- Final consonant deletion – “ca” for “cat”
- Cluster reduction – “pane” for “plane”
- Assimilation – “gog” for “dog”
Phonological disorders are not due to problems with physical sound production but rather with how sounds are used and understood within the language. These patterns are typically developmental but may persist beyond the expected age, reducing speech intelligibility and affecting phonemic awareness and early literacy skills (ASHA, 2023a).