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Steven Rasmussen is a mathematics educator and co-founder of Key Curriculum Press. He studied the mathematics tests of the Smarter Balanced Assessment Consortium and concluded that the tests are so flawed that they should not be used.
He has written a report, analyzing sample questions, which can be found here, by opening a pdf file.
This is his summary:
This spring, tests developed by the Smarter Balanced Assessment Consortium will be administered to well over 10 million students in 17 states to determine their proficiency on the Common Core Standards for Mathematics (CCSSM). This in-depth analysis of sample mathematics test questions posted online by Smarter Balanced reveals that, question after question, the tests (1) violate the standards they are supposed to assess, (2) cannot be adequately answered by students with the technology they are required to use, (3) use confusing and hard-to-use interfaces, or (4) are to be graded in such a way that incorrect answers are identified as correct and correct answers as incorrect. No tests that are so unfair should be given to anyone. Certainly, with stakes so high for students and their teachers, these Smarter Balanced tests should not be administered. The boycotts of these tests by parents and some school districts are justified. In fact, responsible government bodies should withdraw the tests from use before they do damage.