Unlike articulation errors, which affect individual sounds, phonological processes affect whole groups of sounds. Most fade as speech matures; when they persist beyond the expected age, targeted therapy — often using minimal pairs — can help.
Common phonological processes
- Fronting — back sounds /k, g/ replaced with front sounds /t, d/ ("tat" for "cat").
- Stopping — fricatives like /f, s, sh/ replaced with stops /p, t, d/ ("tun" for "sun").
- Gliding — /r, l/ replaced with /w, y/ ("wabbit" for "rabbit").
- Deaffrication — affricates "ch, j" replaced with fricatives ("ship" for "chip").
- Final consonant deletion — the last sound in a word is dropped ("ca" for "cat").
- Consonant cluster reduction — a blend is simplified ("top" for "stop").
How phonological processes are treated
Therapy often uses minimal pairs — word pairs that differ by one sound (e.g. "key/tea") — to help a child hear and fix the contrast. Practice progresses from listening, to single words, to sentences and conversation, with plenty of repetition.
Practise without the prep
Chatter Labs is a no-prep speech app for SLPs with built-in minimal-pairs activities and assignable practice, so children can target these patterns in a game they enjoy.
Frequently asked questions
Articulation errors affect individual sounds (e.g. a distorted /s/); phonological processes are patterns affecting groups of sounds. See our articulation therapy guide.
Most processes fade by ages 3–5, though some (like gliding of /r/) persist longer. A speech-language pathologist can say whether a pattern is age-appropriate.
Minimal pairs are words that differ by a single sound (e.g. "key/tea"). They help a child notice the difference between their error and the target sound.
If a process persists past the expected age, or speech is hard to understand, an evaluation by a speech-language pathologist is recommended.