She tells of two groups of fifth grade students who took a test. Afterward, one group was told, “You must be smart.” The other group was told, “You must have worked hard.” When a second test was offered to the students, they were told that it would be harder and that they didn’t have to take it. Ninety percent of the kids who heard “you must be smart” opted not to take it. Why? They feared proving that the affirmation may be false. Of the second group, most of the kids chose to take the test, and while they didn’t do well, Dweck’s researchers heard them whispering under their breath, “This is my favorite test.” They loved the challenge. Finally, a third test was given, equally as hard as the first one. The result? The first group of students who were told they were smart, did worse. The second group did 30% better. Dweck concludes that our affirmation of kids must target factors in their control. When we say “you must have worked hard,” we are praising effort, which they have full control over. It tends to elicit more effort. When we praise smarts, it may provide a little confidence at first but ultimately causes a child to work less. They say to themselves, “If it doesn’t come easy, I don’t want to do it.”