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.
Diane Ravitch's blog 
Reblogged this on Exceptional Delaware and commented:
Delaware parents: This is the test your children start next week. Please read this. When the experts say this test is bad, you need to listen! Please opt your child out today. Whether they are really smart, bad at taking tests, special needs, or just an average student. Even if they are a horrible student. Email the principal, superintendent and board members of your child’s school, print a copy, bring it to school on Monday, and sleep easily the next few months knowing your child is not taking this test.
Diane, Thanks for bringing this to my attention. Rasmussen has many of the same concerns as I do. I posted about this to my blog. Guy Brandenburg
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Doesn’t NCLB require that states submit technical and validity reports to USDOE before the tests can be given? Or is that just my imagination? Is there ANY accountability mechanism in place to ensure test quality and validity, or do the states simply use our taxpayer money, pay million$ for them, and then give the tests willy nilly, a la common core lack of due diligence?
Deborah, see Missouri’s rejection of SBAC, they asked the questions you ask. Most states are under no such stipulations. Their motto: In Hoc Signo Vinces $$$$. They have plenty of ammo.
It doesn’t matter to those who produced and those who contracted for the tests that there are so many problems because correctness and validity were never the goals to begin with.
Making money and closing schools were.
The people making and requiring the tests really don’t care about our kids. In fact, they undoubtedly laugh about them in their board rooms.