Parents often asked me about the difference between an articulation disorder and a phonological disorder.  Here is the difference:

Articulation (Phonetic) Disorder:

Articulation is the process by which sounds, syllables, and words are formed when your tongue, jaw, teeth, lips, and palate alter the air stream coming from the vocal folds. When an individual cannot produce or distorts an age-expected sound, it affects the ability of the person to be understood.  With an articulation disorder, the child has difficulty saying certain sounds or consonants- for example “wake” for “rake” or as seen with a lisp. Articulation disorders are motor errors than can occur among people of any age; however, they are most common in children whose articulators have not fully developed properly.

Phonological Process Disorder:

A phonological disorder is a simplification of the sound system that also affects intelligibility. Children with phonological processes have difficulty in acquiring a phonological system; involving organizing the patterns of sounds in the brained the output.; not necessarily in the motor production of the sounds like articulation errors.  For example, “fronting” is when sounds that should be produced  by the tongue moving up in the back of the throat are replaced with front sounds -“cake” becomes “take” or “gold” becomes “dold”.  This is typically seen in children whose speech would be considered unintelligible, but can also be seen in children through kindergarten that are developing normally.  Other examples of phonological processes include initial and final consonant deletion, cluster reduction, stopping, backing, gliding, syllable reduction, and consonant harmony.

Both articulation and phonological disorders put a child at risk for difficulties in school, both academically, as well as socially.  If you feel that your child may have a speech disorder, be sure to have his/her speech evaluated by a licensed speech-language pathologist.