In Willingham’s chapters 2 and 3 he mainly discussed two major concepts, first that students must have background knowledge in order to think critically about a concept and second how human memory systems work and how that relates to making meaning. Both concepts have major implications for teachers and students when it comes to learning. Background knowledge is essential for learning for a few reasons. First, background knowledge is essential for critical thinking because in order for students to practice skills they must first have factual knowledge about a topic and an understanding of the vocabulary surrounding it. Additionally, students need background knowledge because it allows for new information to be connected to new concepts and for content to be chunked into manageable parts that your working memory can make meaning from. Background knowledge also serves to help clarify details of a story, problem, or concept that might be “ambiguous and confusing” (Willingham, pg 12).