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This is one of the most common laments from educators. Your students may perform well on your assessment instruments, yet say things in class which leave you wondering if they really understand the underlying concepts.
Perhaps you're at the beginning of a unit and are unsure about what your students already know. Or, maybe you want to determine if a unit changes their understanding. Or, you might simply want to know which concepts they already grasp, and which ones will you have to address? If any of these doubts and questions sound familiar, then