Failure is when a student doesn't leave the class knowing more than when he entered. There are many types of failing students. They all deserve our help. A Twelve Step Program Identify failure early and act on it. This includes getting evidence of students level and abilities within the first week of class through testing, in class writing, and interviews.
Many students are anxious to deny there is a problem.
Don't worry, teacher. Be specific and blunt. There is not a single correct sentence in this composition. Also use your good judgment. Some students need this more than others.