What the Dog Saw [129]
He pointed to his screen. Daniel had thrown a dart, and, just as he did, a defensive player had hit him squarely. “See how he popped up?” Shonka said. “He stood right there and threw the ball in the face of that rush. This kid has got a lot of courage.” Daniel was six feet tall and weighed 225 pounds: thick through the chest and trunk. He carried himself with a self-assurance that bordered on cockiness. He threw quickly and in rhythm. He nimbly evaded defenders. He made short throws with touch and longer throws with accuracy. By the game’s end, he had completed an astonishing 78 percent of his passes, and handed Nebraska its worst home defeat in fifty-three years. “He can zip it,” Shonka said. “He can really gun when he has to.” Shonka had seen all the promising college quarterbacks, charted and graded their throws, and to his mind Daniel was special: “He might be one of the best college quarterbacks in the country.”
But then Shonka began to talk about when he was on the staff of the Philadelphia Eagles, in 1999. Five quarterbacks were taken in the first round of the college draft that year, and each looked as promising as Chase Daniel did now. But only one of them, Donovan McNabb, ended up fulfilling that promise. Of the rest, one descended into mediocrity after a decent start. Two were complete busts, and the last was so awful that after failing out of the NFL he ended up failing out of the Canadian Football League as well.
The year before, the same thing happened with Ryan Leaf, who was the Chase Daniel of 1998. The San Diego Chargers made him the second player taken over all in the draft, and gave him an $11 million signing bonus. Leaf turned out to be terrible. In 2002, it was Joey Harrington’s turn. Harrington was a golden boy out of the University of Oregon, and the third player taken in the draft. Shonka still can’t get over what happened to him.
“I tell you, I saw Joey live,” he said. “This guy threw lasers, he could throw under tight spots, he had the arm strength, he had the size, he had the intelligence.” Shonka got as misty as a 280-pound ex-linebacker in a black tracksuit can get. “He’s a concert pianist, you know? I really — I mean, I really — liked Joey.” And yet Harrington’s career consisted of a failed stint with the Detroit Lions and a slide into obscurity. Shonka looked back at the screen, where the young man he felt might be the best quarterback in the country was marching his team up and down the field. “How will that ability translate to the National Football League?” He shook his head slowly. “Shoot.”
This is the quarterback problem. There are certain jobs where almost nothing you can learn about candidates before they start predicts how they’ll do once they’re hired. So how do we know whom to choose in cases like that? In recent years, a number of fields have begun to wrestle with this problem, but none with such profound social consequences as the profession of teaching.
2.
One of the most important tools in contemporary educational research is value added analysis. It uses standardized test scores to look at how much the academic performance of students in a given teacher’s classroom changes between the beginning and the end of the school year. Suppose that Mrs. Brown and Mr. Smith both teach a classroom of third graders who score at the fiftieth percentile on math and reading tests on the first day of