One of the most vulnerable things you can do as a graphic designer is hand your design files off to someone else. It's the most nerve wracking thing on the face of the planet. It's one thing if you're digging around in your Photoshop file and doing some crazy things. You know what you're doing and you don't always need notes. On the flip side, it's difficult for the person you might hand that design file off to, to figure out what was going through your mind. It's a pain in the butt. You probably had the same feeling when you received a file from another designer. It's a gut-wrenching feeling when you open a file up to see layers everywhere.