Helping Multilingual Learners succeed requires advancing their English proficiency while also engaging them in grade-level academic content. This brief is the first in a series that explores how formative assessment can support teachers to design and facilitate instruction positioned just beyond students’ current abilities to reach that goal. By integrating instructional methods with formative assessment practices, educators create meaningful learning opportunities that empower multilingual students to engage with rigorous content, develop their language abilities, and achieve improved outcomes.