Findings from the Delphi Study explore the definition of dyslexia.

The Delphi papers have been submitted to academic journals for peer review. The study aimed to establish ‘areas of consensus among a wide range of experts’ and to reduce ‘confusion and misinformation’ about how dyslexia should be defined.

The SpLD Assessment Standards Committee (SASC) has advised that assessors are free to use the Dephi definition but advised to look out for any relevant updates if and when the Delphi papers are accepted for publication. Their briefing paper summarises key points from the framework, its rationale, gives links to the full paper and a note on how to reference to the definition. SASC Briefing Paper Delphi Dyslexia Study May 2024

Two papers summarising the findings of Delphi study into the definition of dyslexia have now been published in draft format on the Open Science Framework.

  1. Julia Carroll, Caroline Holden, Philip Kirby, Paul Andrew Thompson and Margaret J. Snowling (2024).
    Towards a consensus on dyslexia: Findings from a Delphi study.
  2. Philip Kirby, Caroline Holden, Paul Andrew Thompson, Maggie Snowling and Julia Carroll (2024). Towards a consensus for dyslexia practice: Findings of a Delphi study on assessment and identification.

The British Dyslexia Association (May 2016) reported, ‘It is important to note that the proposed definition identifies the same or similar underlying cognitive indicators of dyslexia, alongside recognition of its impact on individuals. For this reason, there is no suggestion that anyone diagnosed under the previous definition would not continue to meet the criteria for a diagnosis.’ Findings from the Delphi Dyslexia Study – British Dyslexia Association (

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