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Percentage of Consonants Correct

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What is it?
an articulation test used to measure the number of correct consonant sounds produced compared to the number of consonant sounds attempted
Why was it designed?
to provide a more objective measure of speech intelligibility and severity versus largely subjective methods used
How do you measure PCC?
total number of consonants measured to be "correct' divided by the total number of attempted consonants in same speech sample multiplied by 100
How long is the typical speech sample?
usually ranges from 5-10 minutes in duration
What is an important aspect of PCC?
it takes into consideration both dialect and casual language differences instead of just focusing on correct pronunciation of words
Why is PCC used?
-to determine if treatment is needed for patients whose speech contains multiple substitutions and deletions
-to allow clinicians to monitor therapy progress, to assess efficacy of therapy approach being administered, and to revise any articulation goals
-used to determine eligibility of services in a school district
-best researched procedure
How do you acquire a speech sample?
-record an uninterrupted speech sample with minimum of 50-100 words
-decipher connotation of utterances
-isolate and eliminate dialectical variations, casual speech enunciation, or allophonic differences
How do you acknowledge exclusion criteria?
-only intended consonants in words should be considered (disregard all vowels)
-disregard a consonant that is repeated consecutively
-exclude words that are incomprehensible or whose gloss is undecipherable (dismiss target consonants located in third or subsequent repetition of adjacent words unless pronunciation of word changes)
How do you determine erroneous consonant productions?
-mark incorrect the consonant changes
-deletion of initial /h/ and substitution of final n/ng are errors only when they occur in stressed syllables
-scoring will depend on dialectical variations and casual speech production
-allophonic differences will be marked correct
What consonant changes are noted/ marked incorrect?
deletions
substitutions
distortions
additions
partial voicing of initial consonants
How do you calculate the PCC?
take number of correct consonants and divide it by the total number of consonants attempted. multiply results by 100
What do you do after quantifying the PCC?
determine the level of severity: mild- severe
What do SLPs have to say about PCC?
most recommend the GFTA as opposed to the PCC, altho PCC is more common in educational systems
What are researchers using PCC for?
to monitor treatment when correct sound production and usage are extended into conversational speech
How is PCC currently seen in the field?
as an informal assessment used to determine if the standardized test adequately tested the child's skills
What are some major advantages to using the PCC?
-useful when percentiles on standardized measures are close to levels indicating concern, it can be helpful to use a smaller difference
What are some major disadvantages to using the PCC?
informal test, cannot be used alone