A turnaround document is a document that describes how you plan to turn around a business, department, or project. It typically outlines the steps you plan to take to make changes and improvements in order to make the business, department, or project successful. Basically, it's a plan or road map for how you're going to make a situation or thing better. Think of it like a detour sign: it can point you in the right direction and show you the best route to success.