...
Participants select wrong answers all the time. And most of the time, they really are wrong. Occasionally, though, they’re right, because we missed onea correct answer in our tree.
It seems that no matter how thoughtfully we construct our trees and tasks up front, and mark which answers are correct, once we launch the test and start looking at click paths, we always seem to find more correct answers that participants have “discovered” on their own.
...