I've been teaching for over 10 years and have been involved with a national standardized test the whole time. I've analysed, administered and marked the test. Standardized tests can be great tools for teachers. They tell the educators where the problems occur. They are not good tools for judging teachers. There are so many factors that effect marks. I've seen so many children who choke on the test or the test is written in a way that confuses the child. The child may have a problem sitting for 1/2 hour or sitting quietly. Stress is a huge factor. As a teacher I can go through the whole test and view every question and the answers that the children in my class made. Quite often a mistake is not totally wrong. The child may be 80% towards understanding but that is not reflected in the final marking but as a teacher I quickly fix the problem. The other big problem with standardized testing is cheating at the top level. I can give you evidence of a school changing answers and manipulating data to better the overall school score. When I asked about it I got the "Lance Armstrong excuse", we need to do it, to keep up with all the other schools who cheat. Bad teachers are promoted because they keep their mouths shut. Standardized testing is one tool. As a teacher there are so many other tools that are far more effective.