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Every weekday I’m sharing the top education stories from around the Web. Today will be quick as we’re preparing for some comprehensive test score coverage. This morning: Beware of making too much out of short-term test score trends, some education experts begin defining effective teachers and teachers unions may be more powerful than we realize.

• Timely as we prepare to look at results from the Hawaii State Assessment: Jay Williams at The Washington Post when reporting test scores. Don’t get too excited about short-term changes, he says.

• Education experts at The National Journal are weighing in on , because the Obama administration’s Elementary and Secondary Education Act asks states to do just that. Interesting array of thoughts and ideas there. Check them out.

• An Education Next article today tells a tale demonstrating teachers unions can be.

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