In all classrooms, teachers can count on finding a wide range of learners. This is, of course, an essential aspect of the human condition. Teachers who are committed to developing curriculum and instruction that reaches all students, and doesn’t stigmatize anyone, must devote time and attention to the practice of formative assessment.Ongoing classroom assessments need not be complicated or time-consuming and, indeed, can be considered instructional activities in and of themselves. There are almost limitless genres and formats for informal classroom assessments, from quizzes and tests to semantic maps and learning logs. Some teachers find a few routine assessments that they use frequently, which provides continuity and predicable routines for students, such as use of an exit slip with a simple written prompt to assess if students “got” the key teaching point for the lesson.