Four different children produce the word "elephant" three times with the results as shown below. Which child is most likely to have Inconsistent Phonological Disorder?

Four different children produce the word "elephant" three times with the results as shown below. Which child is most likely to have Inconsistent Phonological Disorder?

• A. "elephant" → [ɛwəəpʌnt]; "elephant" → [ɛləəfʌnt]; "elephant" → [ɛwəəfʌnt]
• B. "elephant" → [lɛləəp]; "elephant" → [lɔlipʌnt]; "elephant" → [lɔlipɔp]
• C. "elephant" → [ɛwəəfʌnt]; "elephant" → [ɛləəfʌnt]; "elephant" → [ɛwəəfʌnt]
• D. "elephant" → [ɛwəəpʌt]; "elephant" → [ɛwəəpʌt]; "elephant" → [ɛwəəpʌt]

Answer: (B)

Inconsistent Phonological Disorder shows up when a child’s productions of the same word vary widely across attempts, with no single, repeatable error pattern. Here, the productions of elephant differ in multiple places across the three attempts, not just in one small way but in several segments of the word. One trial ends with a simple final consonant like p, another with a final cluster like nt, and another with a different ending altogether; the middle portions and sometimes the onset shift as well. This lack of a stable substitution or simplification across attempts is exactly how IPD presents: the child isn’t applying one consistent phonological rule, but displays multiple, inconsistent patterns. Other children tend to show more uniformity (either the same wrong sound repeated, or a consistent type of simplification or substitution across all attempts), which points away from IPD.

Inconsistent Phonological Disorder shows up when a child’s productions of the same word vary widely across attempts, with no single, repeatable error pattern. Here, the productions of elephant differ in multiple places across the three attempts, not just in one small way but in several segments of the word. One trial ends with a simple final consonant like p, another with a final cluster like nt, and another with a different ending altogether; the middle portions and sometimes the onset shift as well. This lack of a stable substitution or simplification across attempts is exactly how IPD presents: the child isn’t applying one consistent phonological rule, but displays multiple, inconsistent patterns.

Other children tend to show more uniformity (either the same wrong sound repeated, or a consistent type of simplification or substitution across all attempts), which points away from IPD.