Suppose a math textbook contains an overview chapter for each part of the textbook. The intent of those overview chapters is to motivate and introduce the new mathematical concepts which will be discussed in the respective part of the textbook. For example, why do we need the mathematical concept? How did the concept evolve in history? What will be the content of the next chapters?
In this context, will the overview sections facilitate learning? How important are overview chapters in textbooks for the success of learning?
Note: I reasked this question on matheducators.stackexchange.com.