In screenwriting (writing for movies and TV), the logline is key to brainstorming story ideas and also selling them or "pitching" them to buyers. Crafting loglines can help the writer to flesh out new plot ideas before writing the entire script. It's much easier to revise the logline rather than an entire hundred page script!
Motivating struggling writers can be quite a challenge. With struggling writers, it is important to create high-interest assignments that students will want to work on, assignments that they will want to put forth the effort on in order to succeed. If struggling students are bored with a writing topic, they won’t be as invested in it and won’t want to put the time and effort in to make it the best it can be.