But to make the most of these new opportunities, families need the full picture.

So, what information do they have currently? And what additional data would it make sense for them to have?

When it comes to public schools, whether neighborhood schools, magnets, or charters,  are academic achievement and year-to-year growth in math and reading, as measured on standardized tests.

Although this information is crucial — something is very wrong if the kids can’t pass the tests — critics from of the aisle rightly note that it that families about a school’s academics.

For example, what about subjects like history and science, which are tested less frequently than reading and math? What about foreign languages, the arts and other subjects that aren’t tested at all? And what about all the stuff that good schools impart that tests don’t capture, like critical thinking, teamwork, self-discipline and respect for others?  

For years, education reformers who believe that data are critical to improving America’s schools but recognize the limitations of standardized tests have struggled to answer these questions. That’s why  that explores a new and potentially powerful measure of school quality called high school readiness is so exciting.

As the name suggests, the basic idea is to capture how well a middle school prepares its students for the next stage of their education by quantifying its effects on high school grades—or to be more precise, ninth-grade grade-point averages.

The report finds that middle schools have a significant impact on students’ future grades. For example, in North Carolina and Maryland, attending a middle school with a strong high school readiness score boosted a student’s ninth-grade GPA by approximately one-tenth of a grade point.

Effect of Attending a Middle School with a Higher High School Readiness Score on Ninth-Grade GPA

One-tenth of a grade point may not sound like much, but it’s enough to keep a marginal student out of the or . And that increase is fairly impressive when you consider the number of factors that can affect GPA, from the quality of a student’s elementary school to his or her socioeconomic circumstances and home life.

Importantly, schools’ influences on GPAs aren’t necessarily the same as their effects on test scores. In fact, the two are only weakly correlated. 

Middle Schools That Boost Students’ Test Scores Don’t Necessarily Boost Their High School GPAs

In other words, analyzing middle schools’ effects on grades reveals something new and different about how schools serve students — which the many families who don’t care exclusively about test scores might want to consider when choosing a school.

While it may seem strange to suggest evaluating middle schools based on their students’ high school readiness, many states already do something similar at the high school level, where indicators of college and career readiness have long been an  of school report cards.

And while there are technical challenges associated with isolating middle schools’ effects on high school grades, most states already provide publicly available school report cards, and most already collect data on students’ high school GPAs. So, with a bit of number-crunching and some clear messaging, a new high school readiness indicator could give families the information they’re looking for — and begin to move America’s education system away from its obsession with standardized tests and toward a broader concept of student success.

As educational options expand, so should the information available to families. Test scores alone will never paint a complete picture of school quality or student success. But in the age of big data, there is no shortage of paint.