Which of the following is NOT considered a type of articulation disorder?

The correct understanding of this question hinges on recognizing the definitions of different terms related to articulation disorders. Articulation disorders involve difficulties in the physical production of sounds, leading to problems in speech clarity.

Distortion refers to the incorrect production of a sound, making it sound different from the target sound. Substitution involves replacing one sound with another, such as saying "wabbit" instead of "rabbit." Omission occurs when a sound is left out entirely, such as saying "ca" instead of "cat."

In contrast, assessment is the process of evaluating an individual’s speech and language abilities to identify strengths and weaknesses. It is not an articulation disorder itself; rather, it is a clinical procedure used to diagnose and understand the nature of potential speech issues, including articulation disorders. Therefore, this option does not align with the characteristics of articulation disorders, making it the correct answer to the question.