‘What am I going to write about’ is the most important question that you’ve got to ask yourself before you start writing any paper. But it’s even more important when you’re deciding what you’re going to do for your midterm. After all, with a shorter paper a poor topic can still be fudged as there is generally enough pre-amble and post-amble to get you through.
When the paper gets longer, however, that’s no longer possible. You actually have a big body to fill and you better make sure that you fil