Speech Sound Disorders

Per ASHA (2019) Speech sound disorders refer to any difficulty or combination of difficulties with perception, motor production, or phonological representation of speech sounds and speech segments. Speech sound production requires both the phonological knowledge of speech sounds and the ability to coordinate the jaw, tongue, and lips with breathing and vocalizing in order to produce speech sounds. Speech sound disorders can be organic or functional in nature. Organic speech sound disorders result from an underlying motor/neurological, structural, or sensory/perceptual cause. Functional speech sound disorders are idiopathic—they have no known cause.

The figure below can be found on the Asha website. I like it because it provides a clear visual associating origin, cause, and behavioral type.