Dream and be real: You have to walk a fine line here. On the one hand you must think big. Whether you want to manage a billion dollars, or create new brain technology industries, or fix Africa – whatever it is, you should communicate high aspirations and a potential career worthy of an MBA graduate in 20 years time. On the other hand you must demonstrate career-path realism: your dreams will take a lifetime to mature, and even then they may not. You should sound like you understand how careers evolve in your field and the ways you might have to “do your time” (even if highly paid) before you become a true titan of your industry