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Glaspey Dynamic Assessment of Phonology (GDAP)

Author: Amy Glaspey, PhD, CCC-SLP

  • Speech Sounds
  • Ages 3 through 10
  • Testing Time: 2-3 minutes/phoneme
  • Individual Administration
  • Qualification Level B

The Glaspey Dynamic Assessment of Phonology is the first standardized, dynamic assessment of speech production and stimulability. This ground-breaking approach provides for a more sensitive measure that takes into account the emergence of skills and the child’s ability to learn, not just the final speech product.

  • Assesses the amount of help a child needs to correctly say sounds or patterns that have been produced in error.
  • Employs a unique 15-point cueing hierarchy for 24 phonemes in initial and final position, syllable patterns, and consonant clusters. (The 15-point scale represents the number of scaffolds available to the child in the production of a phoneme.)
  • Can be used to differentiate the levels across children, to plan treatment in a more precise manner, and to document progress before, during, and after treatment.
  • It is particularly useful during the early phases of treatment and over short periods of time when other measures may not show change or differentiate children.
  • Clinicians may choose to administer the test items that are thought most appropriate to meet the child’s needs. Individual scores are generated for each phoneme. Scores may then be averaged for a subset score based on sound class, or averaged for a Total average score.
  • The GDAP employs a unique 15-point cueing hierarchy which represents the scaffolding levels available to a child in the production of a phoneme. A standardized decision matrix is used to determine the progression of prompts and cues, and the speech environment complexity. The GDAP matrix can be administered via paper and pencil, or easily through the ATPOnline interface.

The GDAP has 49 items, including 2 multisyllabic words, 22 initial phonemes, 21 final phonemes, 3 initial blends, and 1 final blend. Sound classes represented in the GDAP include:

  • Glides
  • Nasals
  • Stops
  • Velars
  • Stridents
  • Interdentals
  • Liquids

Each item is tested in up to three speech environments using vibrant, child-friendly images:

  • Single Word
  • Two-Word Sentence
  • Connected Speech

    The GDAP was normed on a representative sample of 880 children ages 3.0 through 10.11.

    Administration and Scoring
    The GDAP is designed to be administered flexibly to get a comprehensive assessment of a child’s speech production or to document a child’s response to therapy for individual phonemes or sound classes. Each phoneme can be quickly administered in 2-3 minutes. The Phonetic Inventory which can be administered prior to the GDAP to document the phonemes already in the child’s repertoire, thereby reducing testing time.

    The GDAP is currently in production and will be available in late Fall 2018.

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  • Coming Fall 2018



    Item No.




    GDAP Test Kit


    See Also... (Sold Separately)


    Item No. / Product Title






    Test of Semantic Reasoning (TOSR)



    Auditory Phoneme Sequencing Test (APST)



    Test of Early Language Development-4 (TELD-4)



    Comprehensive Test of Phonological Processes - 2nd Edition (CTOPP-2)



    Practical Test of Articulation and Phonology (PTAP)


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