Tom Brady may be the best quarterback in football, but he is also infamously, hilariously slow. YouTube videos of his 40-yard dash have gotten many thousands of hits from sports fans looking for a good laugh.

If the New England Patriots had chosen a quarterback based only on foot speed, they would have missed out on three Super Bowl victories. But National Football League teams ask prospects to run, jump and lift weights. They interview them for hours. They watch game film. In short, they use multiple measures to determine the best players.

In much the same way that sports teams identify and nurture talent, there is a window of opportunity in public education to create systems that encourage and develop fantastic teachers, leading to better results for students.

Efforts are being made to define effective teaching and give teachers the support they need to be as effective as possible. But as states and districts rush to implement new teacher development and evaluation systems, there is a risk they’ll use hastily contrived, unproven measures. One glaring example is the rush to develop new assessments in grades and subjects not currently covered by state tests. Some states and districts are talking about developing tests for all subjects, including choir and gym, just so they have something to measure.

In one Midwestern state, for example, a 166-pagePhysical Education Evaluation Instrumentholds teachers accountable for ensuring that students meet state-defined targets for physical educ..., such as consistently demonstrating “correct skipping technique with a smooth and effortless rhythm” and “strike consistently a ball with a paddle to a target area with accuracy and good technique.” I’m not making this up!

This is one reason there is a backlash against standardized tests — in particular, using student test scores as the primary basis for making decisions about firing, promoting and compensating teachers. I’m all for accountability, but I understand teachers’ concerns and frustrations.

Even in subjects where the assessments have been validated, such as literacy and math, test scores don’t show a teacher areas in which they need to improve.

If we aren’t careful to build a system that provides feedback and that teachers trust, this opportunity to dramatically improve the U.S. education system will be wasted.

The fact is, teachers want to be accountable to their students. What the country needs are thoughtfully developed teacher evaluation systems that include multiple measures of performance, such as student surveys, classroom observations by experienced colleagues and student test results.

Of particular concern is the possibility that test results alone will be used to determine a large part of how much teachers get paid. I have talked to many teachers over the past several years, and not one has told me they would be more motivated, or become a better teacher, by competing with other teachers in their school. To the contrary, teachers want an environment based on collaboration, in which they can rely on one another to share lesson plans, get advice and understand what’s working well in other classrooms. Surveys by MetLife and other research of teachers back this up.

Teachers also tell me that while compensation is important, so are factors such as high-quality professional development opportunities, a strong school leader, engaged families and the chance to work with like-minded colleagues.

While there is justification for rewarding teachers based in part on how their students perform, compensation systems should use multiple measures, including classroom observation. In top-performing education systems in other parts of the world, such as Singapore and Shanghai, accomplished teachers earn more by taking on additional responsibilities such as coaching and mentoring other teachers and helping to capture and spread effective teaching techniques. Such systems are a way to attract, retain and reward the best teachers; make great use of their skills; and honor the collaborative nature of work in schools.

States, districts and the U.S. Education Department would do well to encourage the right balance. States such as Connecticut, Delaware and Kentucky are showing leadership in creating feedback and evaluation systems that reflect the patience and involvement of teachers and administrators. This is what’s required to build the kind of infrastructure that stands the test of time.

Exciting progress is being made in education across the country. The challenge now is to make sure we balance the urgency for change with the need to ensure fair ways to develop, evaluate and compensate teachers for the work they do.

Let’s be thoughtful about our approach so that one day we can say this was the moment we joined together to drive the long-term improvement our schools need.