Which of the following is used for spelling diagnostic purposes in dyslexia identification?

The correct approach to identifying spelling difficulties in the context of dyslexia involves comprehensive assessments specifically focused on phonological processing and achievement. The Woodcock Johnson Test of Achievement serves as a broad assessment tool that measures various academic skills, including spelling, and is often used in the identification process of learning disorders like dyslexia. It provides valuable information on an individual's academic performance across multiple domains.

In contrast, tests such as the Comprehensive Test of Phonological Processing primarily focus on phonological skills and may not directly assess spelling in a comprehensive academic context. The Wechsler Individual Achievement Test, while also an achievement test, has a different structure and may not focus on spelling diagnostics as specifically. Finally, the Gary Silent Reading Test concentrates on reading comprehension rather than spelling skills, making it less relevant for diagnosing spelling difficulties. The Woodcock Johnson Test of Achievement's capacity to assess spelling in conjunction with other academic skills makes it a suitable choice for dyslexia identification.