5.2 Assessment of Written Language & Literacy

Assessment of Written Language & Literacy

Written language assessment by speech-language pathologists requires a comprehensive evaluation of both receptive written language (reading) and expressive written language (writing and spelling). Because spoken and written language share underlying linguistic foundations (phonology, morphology, syntax, semantics, and pragmatics), deficits in oral language frequently manifest as literacy impairments.

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1. Theoretical Frameworks of Reading Assessment

The Simple View of Reading (SVR)

The Simple View of Reading (Gough & Tunmer, 1986) conceptualizes reading comprehension ($RC$) as the product—not the sum—of Decoding ($D$) and Language Comprehension ($LC$):

$RC = D \times LC$

Because the relationship is multiplicative, if either variable equals zero, total reading comprehension equals zero. This framework yields four clinical reader profiles:

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Scarborough's Reading Rope

Gough & Tunmer's model is further elaborated by Scarborough's Reading Rope (2001), which divides reading into two main strands that intertwine over time to achieve fluent execution:

1. Word Recognition Strand (Becomes Increasingly Automatic):
   • Phonological Awareness (syllables, phonemes)
   • Decoding (grapheme-phoneme correspondences)
   • Sight Recognition (familiar orthographic patterns)
2. Language Comprehension Strand (Becomes Increasingly Strategic):
   • Background Knowledge (facts, concepts)
   • Vocabulary Knowledge (breadth, precision)
   • Language Structures (syntax, semantics)
   • Verbal Reasoning (inference, metaphor)
   • Literacy Knowledge (print concepts, text structure)

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2. Assessment of Phonological Awareness & Word Recognition

The Phonological Awareness Hierarchy

Phonological awareness is the explicit awareness of the sound structure of spoken language. Assessment must evaluate tasks along a continuum of cognitive and linguistic complexity:

1. Shallow Phonological Awareness:
   • Word awareness (counting words in a sentence)
   • Syllable segmentation and blending ("table" ➔ /teɪ/ - /bəl/)
   • Rhyme detection and production
   • Onset-rime segmentation ("cat" ➔ /k/ - /æt/)
2. Deep Phonological (Phonemic) Awareness:
   • Phoneme isolation (identifying initial, final, medial sounds)
   • Phoneme blending (combining /k/ - /æ/ - /t/ ➔ "cat")
   • Phoneme segmentation (breaking "stop" into /s/ - /t/ - /ɑ/ - /p/)
   • Phoneme Manipulation (Highest difficulty): Deletion ("Say 'smile' without the /s/" ➔ "mile") and Substitution ("Say 'cat', change /k/ to /b/" ➔ "bat").

Decoding and Pseudoword Reading

To evaluate automatic word recognition versus reliance on visual memory, SLPs must administer both real-word and pseudoword (nonword) reading subtests (e.g., using tasks from the Word Attack subtest of the Woodcock-Reading Mastery Tests or WRMT-3):

• Pseudoword Reading ("bip", "splong", "grem"): Isolates pure grapheme-to-phoneme decoding mechanisms by preventing the student from relying on sight-word orthographic memory. Low pseudoword reading scores strongly correlate with core phonological decoding deficits characteristic of dyslexia.

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3. Assessment of Reading Fluency & Comprehension

Oral Reading Fluency (ORF) Metrics

Reading fluency is the ability to read text accurately, at an appropriate pace, and with proper prosody.

• Words Correct Per Minute (WCPM): $\text{WCPM} = \frac{\text{Total Words Read} - \text{Uncorrected Errors}}{\text{Time in Seconds}} \times 60$
• Performance is compared against national oral reading fluency norms (e.g., Hasbrouck & Tindal, 2017). Scores falling below the 25th percentile indicate a significant fluency deficit that impedes comprehension capacity.

Reading Comprehension Evaluation

Assessments must differentiate between:

• Literal Comprehension: Extracting explicitly stated facts directly from the text.
• Inferential Comprehension: Integrating background knowledge with text clues to deduce unstated conclusions, analyze character motives, and predict outcomes.
• Macrostructure vs. Microstructure: Evaluating understanding of overall story grammar (setting, initiating event, internal response, attempt, consequence) versus sentence-level cohesive markers (pronouns, conjunctions).

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4. Assessment of Written Expression & Spelling (Dysgraphia)

Writing is the most cognitively demanding linguistic modality. Comprehensive written language evaluation includes orthographic execution, spelling accuracy, syntax, and discourse structure.

Spelling Error Analysis Framework

Spelling assessments (e.g., Test of Written Spelling, TWS-5) should analyze errors qualitatively across three linguistic domains:

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5. Diagnostic Decision Tree & Clinical Case Scenario

Case Presentation: A 9-year-old 4th-grade student is referred for reading difficulties. Standardized testing reveals:

• Oral Language/Listening Comprehension Standard Score: 104 (57th percentile)
• Pseudoword Decoding (Nonword Reading) Standard Score: 71 (3rd percentile)
• Real Word Identification Standard Score: 74 (4th percentile)
• Reading Comprehension Standard Score: 76 (5th percentile)

Diagnostic Decision Logic

1. Analyze SVR Components: $LC$ is average (SS = 104), but $D$ is severely impaired (SS = 71).
2. Determine Mechanism: Low reading comprehension (SS = 76) is driven entirely by bottlenecking at the word-recognition level, as listening comprehension is fully intact.
3. Diagnostic Conclusion: Developmental Dyslexia. Intervention must prioritize explicit, systematic Orton-Gillingham / Structured Literacy phonics instruction to build orthographic mapping capabilities.