A Guide to the Indigo Dyslexia Centre’s Assessment Framework
At the Indigo Dyslexia Centre, we pride ourselves on utilizing a rigorous practice framework. Drawing upon the consensus statements from the Delphi Dyslexia Study—and supported by the SpLD Assessment Standards Committee (SASC)—our approach focuses on minimizing risks and maximizing the probability of a precise diagnosis.
In this article, we explore the complexities of professional dyslexia screening and how our framework ensures that every individual receives a clear, evidence-based roadmap for their future.
The Foundation: What is Dyslexia?
Dyslexia is more than just “flipping letters.” According to the latest clinical consensus, dyslexia is a set of processing difficulties that primarily affect the acquisition of reading and spelling. While it is rooted in language processing, its impact often extends to:
- Working Memory: The ability to hold and manipulate information in the mind.
- Processing Speed: The time it takes to take in, make sense of, and respond to information.
- Orthographic Skills: The ability to recognize and remember visual letter patterns and words.
At the Indigo Dyslexia Centre, our screening process doesn’t just look at what an individual can’t do; it looks at the cognitive “why” behind those literacy hurdles.
Mitigating Risks: Why “One-Size-Fits-All” Testing Fails
The greatest risk in any dyslexia assessment is failing to account for external factors that mimic dyslexic traits. A “false positive” can be just as detrimental as a missed diagnosis. Our framework requires assessors to be vigilant about several “masking” factors:
1. Educational and Environmental History
If a child has had significant school absences, frequent changes in scenery, or experienced the “learning loss” associated with the COVID-19 pandemic, their literacy gaps might be instructional rather than neurobiological.
2. Language and Cultural Background
For those with English as an Additional Language (EAL), we must distinguish between a processing disorder and the natural process of acquiring a second language. At Indigo, we discount errors clearly attributable to “linguistic interference” to ensure we are measuring cognitive ability, not just English fluency.
3. Trauma and Health
Significant physical or psychological trauma can impact a person’s ability to focus and retain information. Our assessors look at the whole person, ensuring that we aren’t mislabeling the symptoms of trauma as a learning disability.
4. Developmental Language Disorder (DLD)
One of the most significant risks is observing poor oral language but failing to assess it. If an individual has underlying language difficulties, they may have DLD instead of—or alongside—dyslexia. Our framework ensures these nuances are caught and referred for further specialist assessment when necessary.
Increasing Probability: How We Ensure Accuracy
To achieve a high probability of accurate identification, our assessors move beyond simple reading tests. We look for a specific “cluster” of indicators that align with the neuro-atypical profile of dyslexia.
Testing Phonological and Orthographic Skills
We establish weak performance on age-appropriate tests, specifically focusing on:
- Non-word Repetition: Asking the individual to repeat “nonsense” words to test phonological memory without the help of prior knowledge.
- Rapid Automized Naming (RAN): Testing the speed at which an individual can name familiar objects or digits, which is a massive predictor of reading fluency.
- New Word Learning: Observing how a person handles unfamiliar vocabulary.
Intracognitive Variance
Rather than looking for a single “flat” profile, we use intracognitive test variances. We look for the “spiky profile”—the disparity between high intellectual potential and specific, localized weaknesses in processing. This helps us identify not just the struggle, but the areas of strength and resilience that the individual can use to compensate.
Assessing Attainment and Persistence
A hallmark of dyslexia is that the difficulty is persistent despite intervention. At the Indigo Dyslexia Centre, we believe that a one-off diagnostic assessment without background history is a risk to accuracy.
The Importance of History
We review how an individual has responded to previous support. Has there been a history of “low progress” despite effective classroom instruction? Was there a history of late reading independence or “reading aversion”?
For Adults vs. Children
- In Children: We look for persistent difficulties in word and nonsense word reading accuracy that are “unexpected” given their other academic attainments (like excelling in math, science, or the arts).
- In Adults: We look for a history of these struggles and current persisting difficulties in reading fluency and spelling. Many adults have learned to “mask” their accuracy issues, but their reading speed and spelling often remain significant markers.
Leveraging Standardized Tests
While professional judgment and qualitative observations (how a person approaches a task) are vital, they must be anchored by objective data.
Our framework emphasizes using tests that are standardized across appropriate demographics. We avoid out-of-date or weakly standardized tests. We also strictly account for the Standard Error of Measurement (SEM)—recognizing that a single score on a single day is a snapshot, not an absolute truth.
“A discrepancy between intellectual ability and literacy attainment is a useful indicator, but it is not a diagnosis in itself. We look for a convergence of evidence.”
The Critical Role of Fluency
Across all languages and ages, reading fluency is one of the most reliable markers of dyslexia. Some individuals can eventually learn to decode words accurately, but they never become “automatic.”
Our assessments cross-check:
- Timed vs. Untimed Spelling: Does the individual fall apart when under time pressure?
- Prose Reading vs. Single Word Reading: Can they use context to guess, or does their fluency remain low even with meaningful text?
- Efficiency Tests: Using speeded tests for both real and nonsense words to measure the “engine room” of their reading ability.
Considering Co-occurring Difficulties
Dyslexia rarely travels alone. It is a “comorbid” condition that frequently overlaps with:
- ADHD: Affecting sustained attention and executive function.
- Dyscalculia: Difficulties with number sense and math.
- Developmental Coordination Disorder (DCD/Dyspraxia): Affecting motor skills.
Our framework at Indigo Dyslexia Centre ensures that we don’t fall into the trap of “single-cause” thinking. If we suspect ADHD or motor skill issues are the primary drivers of the literacy struggle, we provide referrals to the appropriate specialists. This holistic view ensures the intervention plan actually works.
Why Choose Indigo Dyslexia Centre for Your Screening?
Choosing where to have a dyslexia assessment is a big decision. By following this comprehensive framework—republished by SASC for its excellence—we offer more than just a label. We offer:
- Transparency: Clear and consistent criteria for “unexpected” scores.
- Depth: An exploration of both cognitive weaknesses and personal strengths.
- Expertise: Assessors who understand the impact of EAL, trauma, and age on testing results.
- Actionable Advice: Every screening concludes with targeted strategies for home, school, or the workplace.
Conclusion
Accuracy in dyslexia identification is not just about the tests used; it’s about the framework through which the results are interpreted. By minimizing the risks of environmental factors and maximizing the probability through standardized, multi-faceted testing, the Indigo Dyslexia Centre ensures that every individual is seen, understood, and supported.
If you or your child are struggling with literacy, don’t leave it to guesswork. Ensure your assessment is backed by the highest standards of the Delphi study and SASC guidelines.
