This is a great article on how you to view a brainstorming session. I think he describes the process perfectly. Stormwriting: What It Is and Why You Should Try It | WritersDigest.com In a nutshell, he argues that brainstorming is a process of saying yes to everything, and then building on each idea. "Yes to this idea, ohh, and what can we do on top of it?" That way you can get all the ideas flowing and scale them back later on. In my last Mythic Scribes article on worldbuilding, I urged using the lateral brainstorming process he mentions at the start of the article deliberately to scale the worldbuilding process down and fight worldbuilder's disease. It's interesting and unfortunate that many people can't get beyond that level of brainstorming when it comes to the more key elements of their story.