We've seen a rapid expansion of the title of designer in recent years. A few of my friends were chatting over on the core77.com discussion forums on what a baseline skill set that goes across our profession might be; including industrial/product, graphic, interior, landscape, fashion designers and even architects. Liking Venn diagrams as I do, I decided to make my answer a visual one.
Check out the full discussion and weigh in with your view point HERE. For those of you with less of a palette for diagrams and more of a taste for nostalgic 80's cartoons, I've formatted a version for you as well below.