This is a post by Emma Rudeck on the Concurrent Engineering Site.
When you’re facing a design challenge, changes are you’re going to be looking at lots of different options to find the right solution. Initially, this might mean sketching out ideas in rough or brainstorming concepts that still need development. After you’ve explored these early ideas, you’ll want to develop the best of these ideas further and look at them in greater detail.
The difficulty here is that, as you make the transition to your 3D CAD tool, chances are the tool isn’t set up to try out lots of different ideas. It can be really hard to keep on to of all the decision points and alternative branches that you take as you explore the options. Chances are, you have to make one change to your model and save this version before proceeding to try your next version and save this out as another file and so on and so forth.