An unauthorized workplace perception audit, calibrated against every coworker who has ever smiled at you in a meeting and said something different in the hallway thirty seconds later.
This will not flatter you. That's how you'll know it's working.
The Index measures one thing your performance reviews were never built to catch: the gap between how you think you land in a room and how the room actually experiences you. Everyone has a story about themselves. The Index isn't interested in your story. It's interested in the version that gets discussed after you leave.
Thirteen questions. Every one of them will tempt you toward the answer that makes you look reasonable. Pick that answer as often as you like — the instrument is counting, and it discounts accordingly. Answer like the file is already open, because somewhere, in someone's head, it already is.