Most people think coming up with ideas is what creativity is all about, but evaluating them is just as important. And it's equally important evaluation waits until you're trying to decide which one of your many ideas to use. If that final decision is made in a group, consensus can be hard to reach.
A simple visual like this one can make the whole process much more simple, enjoyable, and engaging. Everyone can see at a glance how bright the group as a whole thinks that idea really is.