Defining Oral Language proficiency, reviewing common assessments, and applying results to testing decisions and eligibility determinations. This session focuses on establishing and interpreting oral language proficiency as a foundational component of bilingual evaluations. Participants will learn practical methods for assessing proficiency and dominance across all languages, selecting appropriate tools, incorporating multiple data sources, and using results to guide defensible eligibility decisions. Emphasis is placed on avoiding common pitfalls and strengthening documentation.