Why is this textbook set up this way? Well, when you’re assigned a piece of writing, you will want to figure out what the rhetorical situation is. From there, you’ll decide on using a strategy or genre to complete the writing. Once that decision is made, you may need to review the writing process and/or dive into some research. The nerd unit is just the cherry on top of everything; you might want to use that unit as a double-check to your grammar, etc. (similar to using the Grammarly or Hemingway apps).