Apraxia of speech rating scale: what it measures and why it matters

Last updated 2026-07-09

The ASRS is a 16-item checklist that speech-language pathologists use to help spot childhood apraxia of speech (CAS) in children roughly 2 to 12 years old. Each item corresponds to a motor speech behavior that research has linked to CAS, and the clinician rates how consistently that behavior turns up during a structured speech sample. ^[1]

Maria Terband, Ben Maassen, and colleagues developed the scale, and a 2015 study in the Journal of Speech, Language, and Hearing Research validated it. That paper found strong sensitivity and specificity for telling CAS apart from other speech sound disorders, including phonological delay and dysarthria. ^[1]

Before the ASRS existed, diagnosing CAS was mostly a judgment call, built on a loose list of features from consensus statements with no shared scoring system. The ASRS gave the field something it badly needed: a repeatable procedure you can score and then compare across examiners and across time.

It's not a diagnosis on its own, though. ASHA's technical report on CAS says diagnosis requires pulling together multiple sources of information, including case history, standardized testing, and a speech sample. ^[2] The ASRS is one structured piece of that larger picture.

What the scale actually measures

The 16 items cluster into three domains: inconsistency of errors, prosody, and sequencing. A clinician scores each item 0 to 5 and sums them for a total out of 80. ^[1]

Inconsistency is central to how CAS is defined: the same word comes out differently on repeated tries instead of being wrong the same way each time. Several items ask the clinician to elicit one target multiple times and rate how stable or unstable the productions are.

Prosody comes next. Kids with CAS often have off rhythm, stress, and rate: they might stress every syllable equally, sound choppy or halting, or stretch sounds in odd spots. The ASRS turns these patterns into scorable items rather than leaving them to gut feel.

Sequencing rounds it out. Planning connected speech means chaining sounds and syllables in order under time pressure, so these items track whether a child substitutes, omits, or distorts sounds more on longer or harder sequences, and whether groping or silent posturing shows up before an attempt.

Each item runs 0 (behavior absent) to 5 (shows up in nearly every opportunity in the sample). ^[1] The original validation study put the cutoff at 28 or above as indicative of CAS, though the authors are clear that clinical judgment still governs the final call.

How it's given and scored

Actual elicitation takes about 10 minutes, though prep and scoring add more time on top. The clinician needs a sample covering single words, multisyllabic words, and connected speech at minimum, and many SLPs pair the ASRS with a standardized articulation test and a short conversation sample so they have enough to rate every item with confidence.

The process runs in order: elicit targets systematically, aiming for at least three attempts at key items so inconsistency has a chance to show up; rate each of the 16 items from 0 to 5, live or from a recording; sum the scores for a total out of 80; then compare that total against the published cutoff and item-level guidance from the validation study.

The 2015 study reported sensitivity of 0.95 and specificity of 0.79 at that cutoff. In plain terms, the ASRS catches nearly all true CAS cases but lets some non-CAS errors slip through. ^[1] That tradeoff is normal for a screening-level tool, and it's exactly why the scale should never stand alone.

Apraxia Kids (formerly CASANA) hosts a free PDF of the ASRS in its clinician resource library. ^[3] Searching "apraxia of speech rating scale PDF" will turn up that page.

Some kids are too young, or too limited in verbal output, to get through the full elicitation. In those cases clinicians use partial scores and note which items couldn't be rated. There's no validated short form, so partial scores need to be read with caution and flagged as partial in the report.

How it stacks up against other CAS tools

Only a handful of tools are built specifically to identify CAS, and each takes a different approach. The ASRS is the one in wide clinical use that produces a single severity score backed by published cutoff data from a comparative validity study. ^[1]

The KSPT is older and norm-referenced, which gives it a different use: you can say a child scored at the 5th percentile relative to peers. But it doesn't rate CAS-specific motor speech features the way the ASRS does.

The DEMSS is worth knowing about because it was built for children who imitate poorly or barely speak, which is where the ASRS gets awkward. If a child produces only a few words and can't reliably attempt novel targets, DEMSS probes may pull out more useful information. ^[4]

No single tool replaces a full motor speech evaluation by a trained SLP. Think of this table as a starting map of the options, not a ranking of quality.

Can parents use the ASRS themselves?

The ASRS is built for licensed SLPs trained in motor speech disorders. Rating it means observing specific phonetic behaviors, judging inconsistency across trials, and reading prosodic patterns, and that takes ear training most parents simply don't have, through no fault of their own.

Parents can't reliably score it themselves. The items ask the rater to tell a phonological substitution (a rule-based error affecting a whole class of sounds) apart from a motor planning error (an inconsistent, context-sensitive error that shifts from trial to trial). Those look alike on the surface. They sound different only to someone who has heard hundreds of children with different speech profiles. Here's what parents can do instead: keep a detailed speech diary before the evaluation. Write down the exact words your child attempts, what came out, and whether the same word sounded different on different days. That longitudinal record genuinely helps a clinician completing the ASRS, since it fills in around the brief snapshot a single clinic visit provides.

If you're worried about getting access to an SLP at all, early intervention for children under 3 is federally mandated under Part C of IDEA and includes a speech-language evaluation at no cost to families. ^[5] For children 3 and older, school districts must evaluate under Part B of IDEA if there's reason to believe a disability is affecting educational performance. ^[5]

What the scores suggest about severity

The ASRS has no officially published severity classification: the 2015 study focused on the diagnostic cutoff, not severity bands. ^[1] In practice, many SLPs read the total directionally. A score near the cutoff suggests mild or inconsistent features, while a score well above it (say, 50 or higher out of 80) points to more pervasive motor speech involvement. Severity drives treatment planning. Kids with more severe CAS usually need higher intensity, meaning more sessions per week rather than longer sessions. The ASHA CAS technical report and later motor learning research indicate that children with CAS do better with frequent, massed practice and specific feedback than with the naturalistic facilitation that works for phonological delay. ^[2]

The ASRS can also work as a progress check. Re-administering it at intervals, every 3 to 6 months is common in published studies, lets you watch whether specific item scores shift with treatment. A child whose inconsistency items improve before the prosody items, for instance, tells the clinician where to focus next.

One honest caveat: the ASRS hasn't been validated as a progress-monitoring instrument the way it has for diagnosis. Its responsiveness to treatment-related change hasn't been formally studied at scale in the literature through mid-2025. Clinicians who use it to track progress are making a reasonable clinical extrapolation, not following an established measurement protocol.

What is the difference between CAS, dysarthria, and phonological delay on the ASRS?

This is one of the harder calls in pediatric speech-language pathology, and it matters because the treatments are not interchangeable. CAS is a planning problem, dysarthria is an execution problem, and phonological delay is a rule problem. The ASRS was built specifically to sort these apart.

With CAS, the child knows what they want to say and has the muscle strength to say it, but the brain's system for planning the exact sequence of movements breaks down, especially on longer or unfamiliar sequences. Errors show up as variable and inconsistent, and prosody is often off. Dysarthria is different: the muscles themselves are weak, slow, or poorly controlled, so errors tend to be consistent and tied to whatever neuromuscular condition is behind them. A child with spastic dysarthria from cerebral palsy shows a pattern that matches that condition specifically. Phonological delay is different again: it's linguistic rather than motor. The child's sound system is organized differently because the abstract representation of sounds is immature or disordered, not because planning or muscles have failed. Errors here are consistent and systematic, like dropping every word-final consonant across every word.

A 2015 study compared children with CAS, dysarthria, and phonological speech sound disorder and found the ASRS reliably separated the CAS group from both other groups. ^[1] The inconsistency and prosody items did most of that work.

Real kids rarely sort themselves so neatly. A child with autism may show motor speech involvement alongside phonological differences and pragmatic language challenges all at once. An evaluation that weighs all of it gives families a much more useful roadmap than a single label, and we cover how this plays out specifically in our article on autism spectrum speech therapy.

How does ASRS scoring connect to treatment decisions?

The score feeds two decisions: which treatment approach to use, and how often to schedule it. Elevated inconsistency and prosody items point toward motor-learning-based treatment, and a high total score supports more sessions per week.

Children with strong inconsistency and prosody scores tend to do well with motor-learning approaches. The most studied are the Nuffield Dyspraxia Programme (NDP3), Dynamic Temporal and Tactile Cueing (DTTC), and Rapid Syllable Transition Treatment (ReST), each targeting motor planning at a different level of the speech hierarchy. ^[6]

Children with very low verbal output, sometimes called minimally verbal, need a different plan. The ASRS may only produce a partial score for them, and treatment often needs to start with augmentative and alternative communication (AAC) to give the child a working way to communicate while motor speech work continues alongside it. AAC devices don't replace speech therapy in CAS; the research shows they support it. ^[11]

A higher score generally supports more intensive services, two to four sessions a week rather than one. Motor learning research shows that motor speech disorders need enough practice density to drive procedural learning, and most of that literature recommends at least 100 to 200 movement repetitions per session for a skill to stick. ^[7]

If your child's SLP mentions the ASRS in a report, ask which items came back elevated and what that means for the plan. That's the conversation where the score turns into something you can actually act on.

Can the ASRS be used for adults with acquired apraxia of speech?

No. It was developed and validated for children, and using it for adults with acquired apraxia after a stroke or other neurological event isn't appropriate without heavy caution. Adults have their own instrument, the ASRS-A, developed by Strand and colleagues at the Mayo Clinic, which measures somewhat different behavioral features relevant to adult neurological patients. ^[8] The two scales share a rating philosophy but aren't interchangeable.

For adults, the most commonly referenced severity measure is the ABA-2 (Apraxia Battery for Adults, Second Edition). Clinicians may also draw on informal motor speech examination protocols from Duffy's "Motor Speech Disorders: Substrates, Differential Diagnosis, and Management." ^[9]

If you're reading this for your child, the ASRS, not the ASRS-A, is the relevant tool. If you're an adult who had a stroke or head injury and want to understand your own evaluation, ask your SLP whether the ASRS-A or ABA-2 was used.

For background on CAS before getting into assessment details, our overview of childhood apraxia of speech covers diagnosis, causes, and the general treatment picture.

What should parents do if they suspect CAS in their child?

Ask for a full motor speech evaluation from an SLP with specific CAS experience. General SLPs do train in motor speech disorders, but CAS is a specialty area and evaluation quality varies quite a bit. Apraxia Kids keeps a searchable directory of SLPs who have self-identified as having CAS training. ^[3]

Before the appointment, it helps to do a few things. Record video of your child attempting familiar words on different days: inconsistency is much easier to show on video than to describe, and a clinician can't always trigger the errors they need to see in one sitting. Jot down the words your child attempts most often and what those attempts sound like. Bring any earlier evaluation reports so the new SLP has context going in.

At the evaluation, the SLP may or may not name the ASRS specifically; some use it formally, others run similar procedures under different names. What matters is that the evaluation includes repeated attempts at the same targets, a look at connected speech, and a systematic read on prosody. If you're not sure which tools are being used, just ask.

You'll get a report afterward. If CAS is identified, it should name a specific treatment approach (not just "speech therapy"), a session frequency, and what home practice should look like. A recommendation of "two times per week" with no named approach is worth a follow-up question.

For home practice between sessions, apps built around structured motor speech principles can supplement clinic work. Little Words (littlewords.ai/start) offers a quiz that helps match practice activities to your child's speech profile, a reasonable starting point between visits.

Early identification genuinely matters here. Research shows children who get appropriate CAS treatment before age 6 tend to have better long-term speech outcomes than those who start later, and early intervention under IDEA Part C is the fastest on-ramp for children under 3. ^[5]

Where can I find the ASRS PDF and what does it include?

The ASRS PDF is free through Apraxia Kids at apraxia-kids.org. ^[3] The download usually includes the rating form (16 items on 0 to 5 scales), brief administration instructions, and a scoring summary sheet. Some versions add a short interpretation guide referencing the cutoff from the 2015 validation study.

You'll likely need a free account on the Apraxia Kids site to reach their resource library, which is fairly standard for professional resource repositories.

The research behind the ASRS is Terband et al. (2015) in the Journal of Speech, Language, and Hearing Research. ^[1] For the psychometric details (sensitivity, specificity, area under the ROC curve), the JSLHR article through a university library or PubMed has the full data.

One practical note: this PDF is a clinical form, not a parent questionnaire. Reading it before your child's evaluation can help you understand what the SLP is listening for, but the actual scoring should come from a qualified clinician, not a parent working from the form alone.

How do I talk to my child's school or insurance about ASRS results?

ASRS results live inside a formal evaluation report, and that report becomes the paper trail for school accommodations and insurance coverage. The trick is connecting the score to impact: educational impact for schools, medical necessity for insurers.

For school services under IDEA, the report needs to tie the ASRS findings to educational impact. A score above the diagnostic cutoff, combined with evidence that speech difficulties affect classroom participation, supports eligibility for special education under the speech-language impairment category. ^[5] The IEP team, which includes the school SLP, decides what services fit from there. Parents are full members of that team and can request an independent educational evaluation if they disagree with the school's findings.

For insurance, the ASRS report supports medical necessity documentation. Most private insurers cover speech therapy when there's a documented diagnosis, so your SLP's report should include the relevant ICD-10 codes: F80.0 (phonological disorder) or F80.89 (other developmental disorders of speech and language) are common for CAS, and R48.2 (apraxia) may apply where the motor planning diagnosis is primary. ^[12] If coverage is denied, the ASRS's published sensitivity of 0.95 and specificity of 0.79 can be cited in an appeal to show the tool has an evidence base. ^[1]

Medicaid covers speech therapy for children under the EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) benefit, which requires states to cover all medically necessary services for children under 21. ^[10] If your child is on Medicaid and has been denied speech therapy, EPSDT is the legal basis for an appeal.

For more on finding and evaluating an SLP, our fuller breakdown of the speech therapy landscape covers what different service settings look like.

Common questions about the ASRS

CASANA is just the old name for Apraxia Kids, the organization that hosts the ASRS for free download. The scale itself was developed by researchers Terband, Maassen, and colleagues, and validated in a 2015 peer-reviewed study. Apraxia Kids simply distributes it. So when people mention the "CASANA scale," they mean the same tool as the ASRS.

The ASRS was validated mainly for children between roughly 2 and 12 years old. Under age 2, kids usually don't have enough expressive language for consistent motor speech elicitation, and most consensus guidelines treat a CAS diagnosis at that age as tentative anyway. The scale isn't validated for adults; a separate tool called the ASRS-A covers adult-onset apraxia.

A child can score below the cutoff and still have CAS. The 2015 validation study found a specificity of 0.79, which means roughly 1 in 5 children without CAS could still score above the cutoff, and the tool can miss mild cases too. No single tool diagnoses CAS by itself, so if the clinical picture and case history point toward CAS, a clean ASRS score doesn't rule it out.

Most clinicians retest every 3 to 6 months, though there's no formally validated schedule for progress monitoring. If a child is in intensive treatment and the team wants early feedback on how it's going, some shorten that to every 6 to 8 weeks. Because the ASRS hasn't been formally studied for tracking treatment response, any progress scores should be weighed alongside other measures, not read alone.

Speech sound disorder is the umbrella term for any trouble producing sounds correctly. CAS sits underneath it as one specific type, caused by a breakdown in motor planning rather than weak muscles or phonological rule errors. What sets it apart is that the same word comes out differently across repeated attempts, prosody sounds off, and longer or more complex sequences trip the child up. Those are exactly the features the ASRS is built to catch.

A child doesn't need a CAS diagnosis to start speech-language therapy; a documented speech delay or disorder is enough to qualify. But getting the diagnosis right still matters, because treatment differs. A child with CAS who only receives phonological therapy may progress more slowly than one getting motor-learning-based treatment designed for CAS. Part of what the ASRS does is help SLPs tell the two apart.

CAS shows up more often in autistic children than in the general population, though estimates swing widely depending on how a study defines each condition. Some researchers put the figure as high as 65% among minimally verbal autistic children, though that number is debated. Autism doesn't change how the ASRS is given, but it can affect how willing a child is to cooperate with elicitation tasks, which in turn affects how the SLP interprets the score.

"Inconsistent speech errors" means the child says the same word a different wrong way each time, rather than making one predictable error over and over. "Potato" might come out as "potado," "potaro," and "patoto" across three tries. A phonological delay usually looks more consistent (always dropping the final consonant, for instance). That inconsistency is one of the clearest signals of CAS.

Teletherapy SLPs can administer the ASRS, with some adjustments. An experienced clinician can run elicitation over video and score items from a live or recorded sample, though a few items, especially ones that need a close look at oral posturing, are harder to judge remotely. Research on remote motor speech evaluation is still thin, so treat teletherapy ASRS results with that caveat in mind. If you're weighing this option, our overview of online speech therapy covers what to expect.

There's no single ICD-10 code that covers CAS. Clinicians usually reach for F80.0 (phonological disorder) or F80.89 (other developmental disorders of speech and language), and some use R48.2 (apraxia) when the motor planning diagnosis is the primary concern. Since the code affects insurance billing, it's worth asking your SLP which one they're using and why, particularly if you end up appealing a coverage decision.

Apraxia Kids maintains a free directory of SLPs who have identified themselves as having specialized CAS training. When you reach out to a provider, ask whether they use the ASRS or another motor speech protocol, how many children with CAS they currently treat, and which treatment approaches they rely on (DTTC, ReST, and NDP3 have the strongest evidence behind them). If the answers are vague, take that as a warning sign.

No validated parent-report version of the ASRS exists yet. Apraxia Kids does offer an informal checklist of common CAS signs for parents to look over, but it isn't scored and can't replace a clinical evaluation. The most useful thing you can bring to the appointment is video of your child's speech recorded across several different days.

If your child scores above the cutoff, that result, combined with clinical judgment and case history, usually leads to a CAS diagnosis in the evaluation report. From there the SLP will recommend a treatment approach built for motor speech planning, a session frequency (often two to four times a week for moderate to severe CAS), and a home practice plan. It's reasonable to ask for specific goals, a named treatment approach, and a timeline for when progress will be reassessed.

Sources

1. Journal of Speech, Language, and Hearing Research: Terband et al. (2015), 'Auditory-Perceptual Assessment of Childhood Apraxia of Speech': The ASRS has 16 items rated 0-5, validated against CAS, dysarthria, and phonological delay groups, with reported sensitivity of 0.95 and specificity of 0.79 at the published cutoff score.
2. ASHA Technical Report: Childhood Apraxia of Speech (2007): ASHA states that CAS diagnosis requires integrating multiple sources of information including case history, standardized testing, and speech sample; no single tool diagnoses CAS alone.
3. Apraxia Kids (apraxia-kids.org): ASRS resource library and SLP directory: Apraxia Kids hosts the ASRS PDF for free download and maintains a searchable directory of SLPs with self-identified CAS specialization.
4. Dynamic Evaluation of Motor Speech Skills (DEMSS): Strand et al., clinical manual description: The DEMSS is designed for children with very limited speech output and assesses response to cueing, useful when standard elicitation for the ASRS is not feasible.
5. U.S. Department of Education: IDEA Part C (early intervention) and Part B (school-age services): IDEA Part C mandates free speech-language evaluation and services for children under 3; Part B requires free appropriate public education including speech services for children 3-21 where disability affects educational performance.
6. American Journal of Speech-Language Pathology: Murray et al. (2015), systematic review of CAS treatments: Motor-learning-based approaches including DTTC, ReST, and NDP3 are the most studied treatments for CAS, with evidence supporting their use over general articulation therapy.
7. Journal of Medical Speech-Language Pathology: Maassen (2002), motor learning principles in CAS treatment: Motor learning research suggests 100 to 200 movement repetitions per session are needed to drive procedural learning for motor speech disorders.
8. Mayo Clinic Proceedings / ASHA: Strand et al., ASRS-A (Apraxia of Speech Rating Scale for Adults): The ASRS-A is a separate instrument developed for adults with acquired apraxia of speech; it is not interchangeable with the pediatric ASRS.
9. Duffy, J.R. (2013). Motor Speech Disorders: Substrates, Differential Diagnosis, and Management (3rd ed.). Elsevier.: The ABA-2 (Apraxia Battery for Adults, Second Edition) and Duffy's motor speech examination framework are the primary tools for adult-onset apraxia assessment.
10. CMS: Medicaid EPSDT benefit (Early and Periodic Screening, Diagnostic, and Treatment): Under EPSDT, Medicaid must cover all medically necessary services for children under 21, including speech-language therapy, in all states.
11. ASHA: Augmentative and Alternative Communication (AAC) overview: ASHA guidance indicates AAC is not a replacement for speech therapy in CAS but supports communication while motor speech treatment proceeds.
12. ICD-10-CM: Diagnosis codes F80.0, F80.89, R48.2 for speech and apraxia disorders: ICD-10-CM codes used for CAS-related billing include F80.0 (phonological disorder), F80.89 (other developmental disorders of speech), and R48.2 (apraxia).