"We're using it as another method for people who want to" take advantage of it.

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He said that using the same method, scientists determined another area that was "ready" for a potentially devastating shaking - northern Chile, close to the border with Peru.

BBC: Further Chile earthquakes 'possible', say scientists

Another 20% would also consider test scores but would be measured differently using a union-backed method.

WSJ: Teacher Evaluation Deal Reached