Kevin O'Conner, the founder of DoubleClick, answers your question very well in his book: "The Map of Innovation: Creating Something Out of Nothing". It's an exc

Kevin O'Conner, the founder of DoubleClick, answers your question very well in his book: "The Map of Innovation: Creating Something Out of Nothing". It's an excellent small book that you can read in an afternoon. He explains his brainstorming process and puts a lot of emphasis on selecting the right idea before spending too much time and effort building it.