How timely.

http://www.latimes.com/news/local/la-me-lausd28-2009jan28,0,5869383.story?page=1

Quote
The Los Angeles teachers union and the city's school district are battling over a district practice that, a Times' analysis suggests, contributes to higher scores on state tests.

The practice is "periodic assessments," a bureaucratic name for exams administered by the Los Angeles Unified School District. The goal is to give teachers insight into what students need to learn while there remains time in the current school year to adjust instruction.The union Tuesday directed teachers to refuse to give them to students on the grounds that the tests are costly and counterproductive.