In the weeks leading up to Tuesday's release of Beyonce's new album I Am...Sasha Fierce, everybody's been wondering what this whole "Sasha Fierce" thing is about. Is it a real person, an alter ego, or maybe some kind of funny nickname she got from Jay-Z? Following an extensive investigation and analysis, we've provided this handy chart to help you understand exactly who and what went into this latest dimension of Beyonce's multi-faceted "personality."