Children are not empty vessels. They come to school with knowledge and experiences that will be relevant to their learning. It is important to find out what your learners know before starting a new topic, or what they remember from the previous lesson. This will ensure that the lesson is not too easy or too hard. There are various techniques you can use to elicit, or find out, what learners know. Don’t assume that because you taught something last week, they know all about it!