September 5 | ABC News

By Sally Ho

Last school year, Common Core-aligned standardized tests marched forward, going from paper-and-pencil to the computer to allow for questions to adapt in difficulty based on a student's answer. A new baseline of testing data was expected as a result. However, many states had technical issues with the electronic form that left them unable to complete the testing. Others saw an unprecedented spread of refusals. That means a new school year without complete testing data in many areas.

Below, we look at the impact of the incomplete data on teachers, students and districts.

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