Probably the most common method of identifying students’ prior knowledge that I see in classrooms today is a KWL chart. During a KWL activity, you ask the students what they already know about a topic (K) or what they think they know about it. Next, you ask what they want to know (W). Then, you teach the lesson and ask them what they learned (L). You can also add an H—How Can We Learn This to create a K-W-H-L organizer.