Textual criticism is the careful analysis of a text's manuscripts to uncover its textual history, including what sorts of changes were made and why. A look at the Book of Mormon Isaiah passages through the lenses of textual criticism reveals a number of features that may have otherwise been missed by readers. Royal Skousen has done nearly exhaustive textual critical work on the Book of Mormon and has discovered at least eight things about the Isaiah passages that help us better understand the text.