The Dyslexia Determination Test has become the standard for Dyslexia diagnosis. The DDT kit covers Grades 2-12 and includes DDT Examiner’s Manual, Decoding book, Reference table for Decoding and Encoding results, a supply of Decoding Pattern A and B Forms plus Interpretation Forms. The DDT provides screening, diagnosis and recommended therapy.

The Spanish version (499000) provides the test words in the respective language, however, each requires an administrator who understands English to score the test.