In a monograph, which is a book$-$length piece of scholarship based on primary$-$ and secondary$-$source research, there is typically an introduction that lays out the book's main arguments. Somewhat less often, there is a conclusion, which recapitulates the arguments and might say something about how things changed after the end of the time period covered by the book. The introduction is the most important part of the book.

A scholarly journal article in History is typically a microcosm of a monograph. The author lays out their argument in the introduction and revisits it in the conclusion. Sometimes these sections are actually labeled, but even if they aren't, they are still there.

One term that can be used to refer to the introduction and conclusion together is the

Question $1$ options:

structure

apparatus

frame