This document discusses using authentic assessment to differentiate between students experiencing language acquisition versus those with learning disabilities. It defines language acquisition as being influenced by social and cognitive factors, while learning disabilities are neurological issues. Several assessment tools are described that can help teachers identify students' challenges, including the Modern Language Aptitude Test, pre-referral assessments, and authentic assessments involving real-world tasks. Authentic assessment is recommended as it evaluates higher-order thinking skills and allows progress monitoring during instruction.