INTRODUCTION: The search for health information on the Internet is growing annually. This fact is of concern to healthcare professionals because of the misconceptions that are conveyed on the Internet causing behavioral changes in patients. This situation is not different in speech-language pathology. OBJECTIVE: To create and validate a questionnaire to evaluate informational sites on dyslexia to assist the professionals and users search for reliable information on this subject. METHODOLOGY: The study was divided into 2 steps: (1) a theoretical reference study on the topics "evaluation of sites" and "dyslexia," and (2) the elaboration and validation of the construct containing the definition of the dimensions and sub dimensions relative the quality of websites on dyslexia. RESULTS: The construct has been defined and contains 3 dimensions are as follows: (1) Reliability, which involves the quality of information on the site and allows the dissemination of reliable information, with "ethical," "scientific," "source information," "authorship" and "credibility," and "purpose of the site" as subdivisions; (2) Relevance, which refers to items that are fundamental and necessary for the clarification of dyslexia such as the concept, diagnosis, and treatment modalities; and (3) Presentation, which refers to the graphical model of the site and the use of available informatics resources. CONCLUSION: The presentation of the website should facilitate clarification and understanding of the information, following the subdimensions "Design" and "Interaction." A questionnaire has been created and is being validated.