LOS ANGELES—Teachers in the Los Angeles Unified School District have agreed on a new system to evaluate their performance.

The Los Angeles Daily News ( http://bit.ly/WQp1IY) says members of the teachers' union have ratified an agreement with the nation's second-largest school district that stipulates classroom observation as well as student tests scores will be used.

The union, United Teachers Los Angeles, had opposed using test scores to rate teachers, arguing that they are unreliable ways of measuring a teacher's effectiveness.

The agreement was announced Saturday after a weeklong voting process and followed months of negotiations.

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Information from: Los Angeles Times, http://www.latimes.com