In this article, the author suggests that good teachers add value in a number of measurable and immeasurable ways. While the gain of a student in mathematics can be measured, it is impossible to measure the impact of a teacher who motivated a child to want to do math. Teachers cannot control how kids enter the classroom and should not be held accountable for factors they cannot control. Teachers do have control over the progress children make and everyone should expect children to make gains regardless of each child's starting point. In Ohio, Battelle for Kids is leading a pilot project involving 78 school districts that follows the growth of the same individual students over time. This includes the data from approximately 718 buildings, 200,000 students or 20 percent of students in grades 3-8 in Ohio. This project, as well as it's proposed benefits are discussed in this article.