The nine 11 project was headed by bill hurst from the new school, and liz phelps at new york university. A total of three thousand 200 forty six subjects asked the same questions i just asked you: where were you who were you with? How did you feel? The participants were asked these same questions a year later, and two years later, and finally on the tenth anniversary of the attack, in 20 11. Hurst finds, on average, a 60 % decline in memory consistency, meaning 60% of the answers changed over time.