If something is written down but not discussed in class, or if sufficient examples are not provided, there may be gaps in the knowledge of students.  Recognizing the differences in learning styles can ensure that teachers always convey important information by all three methods: saying it, writing it, and showing examples. If learning is the process by which we incorporate ideas and information into our memories, then learning theory aims to describe the nature of the process and offer insight into how teaching can be improved.  There are several modern co-existing theories on how we learn, each offering answers to one of several questions - what, when, why, and how.