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Phonolgical Patterns refer to making speech simpler so we can produce the sounds more easily. All kids do this as they are developing speech. They may drop a sound in a consonant cluster (say "poon" for "spoon"), drop a sound at the end of the word (say "bah" for "ball"), or say "back sounds" in the front of their mouth (say "tat" for "cat" fronting the K sound). Usually, as we get older, the patterns go away, or are "suppressed". If they don't go away, then we target that pattern in speech therapy.
Residual speech sound errors refer to specific sounds that kids should learn to produce accurately by a certain age and don't. Common speech sound errors include substituting W for R, TH for S, and Y for L. When these sounds don't develop by a specific age, we target them in therapy.