Objective: Each round runs in two phases. First, choose between two options using the facts shown — one option is the better pick on that information. Then new information arrives, and you decide whether to STICK with your choice or SWITCH to the other option.
The skill being measured: Good deciders update exactly as much as the new evidence deserves. The rounds are built around two opposite failure modes:
Scoring: Your updating decision is correct when it lands you on the option that is best after the new information — whatever you picked first. Results show your Updating Score, your initial reads (how often your first pick was the better one), a breakdown of how you handled reversals versus noise, and which failure mode you lean toward. If the timer is on and runs out in either phase, that round counts as incorrect.
Tips: Ask one question of every update: does this change the comparison, or just the mood? Confirmed facts that alter times, costs, or availability usually do. Anecdotes, urgency theater, and details that affect both options equally usually don't. Changing your mind has no penalty here — and neither does holding firm. Only matching the evidence counts.