SODA Speech - Way to Assess a Child's Speech Errors

“The oldest and most common way to assess a child's speech errors is SODA: Substitution, Omission, Distortion, and Addition. This articulatory approach describes the types of sound errors produced by the child.” 

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https://www.medbridgeeducation.com/blog/2019/
10/sound-advice-assessing-speech-sound-disorders/