Can Someone Please Explain Severe CAS Treatment Simply?
Childhood Apraxia of Speech therapy can start to sound very complicated very quickly.
We talk about principles of motor learning, cueing hierarchies, target selection, repetitions, feedback, approximations, syllable shapes and different treatment approaches.
All of that has value.
But when I’m working with a child with severe CAS, I often come back to one very simple question:
What syllable shape can this child say right now, and what is the next small step up in complexity?
That is one of the simplest ways I think about severe CAS treatment.
Start with the simplest syllable shapes
Think about some of the first types of words babies say:
Mama. Papa. Dada.
These are simple syllable shapes because the same consonant-vowel combination is repeated.
In speech pathology terminology, we call this CVCV reduplicated.
C = consonant
V = vowel
So in mama, the same CV structure is repeated twice.
For some children with severe CAS, particularly children who have a very limited phonemic inventory or who may not have had much babbling, we may need to start right back here.
The goal is to find words that are achievable enough for the child to experience success.
Then gradually increase the complexity
Once a child can say simple repetitive CVCV words such as:
mama
papa
tata
we can begin to increase the complexity.
One way to do this is by keeping the consonants the same but changing the vowels.
For example:
mummy
puppy
turtle
Then we can increase the complexity again by changing both the consonants and the vowels:
muddy
paddy
teddy
Can you see what has changed?
In mama, the pattern repeats.
In mummy, the vowels change.
In muddy, both the consonants and vowels change.
The syllable shape has become more complex.
CVC words also vary in complexity
The same principle applies to CVC words.
A word such as:
pop
is simpler than:
pot
or
mop
because in pop, the consonant at the beginning and end stays the same.
In pot and mop, both consonants change.
So even though all of these words are technically CVC words, they are not necessarily equally easy for a child with CAS to say.
This is why I don’t just think:
“This child needs CVC words.”
I want to know:
Which CVC words?
Which sounds can the child already say?
Which syllable shapes are already established?
And where does the child start to struggle as the complexity increases?
My syllable-shape hierarchy
I often visualise this like building a house.
We start with simpler syllable shapes and gradually build upwards.
Early levels may include:
CVCV repetitive for example: mama, papa, tata
CV and VC for example: me, boo, up, in
C1V1C1V2 where the consonants stay the same but the vowels change for example: mummy, puppy, turtle
CVC repeated where the same consonant occurs at the beginning and end for example: pop, mum
Then we can move towards:
C1V1C2V2 where both the consonants and vowels change for example: muddy, paddy, teddy and more complex CVC words where the beginning and final consonants are different.
From there, we continue building into longer words, more complex syllable structures, clusters, phrases and sentences.
The important point is that we don’t need to jump straight to the top of the hierarchy.
What if the functional word is too hard?
Of course functional words matter.
But sometimes the word everyone desperately wants the child to say is simply too difficult at that point.
That does not mean we abandon the word forever.
It may mean we find a simpler approximation, choose another useful word within a syllable shape the child can manage, or build the underlying syllable shape first.
For example, if a child cannot yet say the adult form of a word, I may accept an approximation that is achievable and understandable.
Then we have something to build from.
Sound choice matters too
During these early stages, I also pay close attention to the child’s phonemic inventory.
If a child already has reliable access to sounds such as p, b, t, d, m, n, h or w, I will often use those sounds when choosing early target words.
I don’t want to make the syllable shape unnecessarily difficult by filling it with sounds the child cannot yet produce.
So target selection is not just about choosing a functional word.
I am thinking about:
the syllable shape
the sounds within it
how established those sounds are
and whether the child has a realistic chance of being successful
It is not a rigid ladder
This hierarchy is not a rule that every child has to follow in exactly the same order.
Children with CAS have individual strengths and weaknesses.
A child might manage one more complex word surprisingly well while continuing to struggle with another seemingly simpler word.
Some words may be highly practised.
Some may be more motivating.
Some sounds may be much more established than others.
So the hierarchy gives me a way to think about complexity, but I am always looking at the individual child in front of me.
So how do I think about severe CAS treatment?
Very simply:
Work out which syllable shapes the child can say successfully, then gradually build towards more complex syllable shapes.
Of course, there is much more to good CAS therapy than syllable shapes alone.
Cueing, repetition, feedback, motivation, approximations and individual differences all matter.
But if CAS therapy is starting to feel overwhelmingly complicated, coming back to syllable shapes can give you a very clear place to start.
And sometimes that simplicity is exactly what helps everything else make more sense.
Want to go deeper?
This is one of the foundational ways I think about severe CAS treatment.
Inside CAS Academy, I go much deeper into how I assess syllable shapes, choose targets, adjust complexity, use approximations and make clinical decisions as therapy progresses.
You’ll also be able to watch extended real assessment and therapy footage so you can see how these decisions actually look with real children — not just read about them in theory.
References
Jacks, A., Marquardt, T. P., & Davis, B. L. (2006). Consonant and syllable structure patterns in childhood apraxia of speech: Developmental change in three children. Journal of Communication Disorders, 39(6), 424–441. https://doi.org/10.1016/j.jcomdis.2005.12.005
Maas, E., Gildersleeve-Neumann, C., Jakielski, K. J., & Stoeckel, R. (2014). Motor-based intervention protocols in treatment of childhood apraxia of speech (CAS). Current Developmental Disorders Reports, 1(3), 197–206. https://doi.org/10.1007/s40474-014-0016-4
Maas, E. (2024). Treatment for childhood apraxia of speech: Past, present, and future. Journal of Speech, Language, and Hearing Research, 67(9S), 3495–3520. https://doi.org/10.1044/2024_JSLHR-23-00233
Murray, E., McCabe, P., & Ballard, K. J. (2014). A systematic review of treatment outcomes for children with childhood apraxia of speech. American Journal of Speech-Language Pathology, 23(3), 486–504. https://doi.org/10.1044/2014_AJSLP-13-0035
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