First adopted into state law in 2010, the evaluation system was hailed as a breakthrough for advocates who argue that teachers should be judged by how much their students learn in the classroom.

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"Once we survive that, it's just a steady threat of radiation, meteorite impacts, and vehicle system failure like fire or ammonia breakthrough, " he posted.

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Later he also said that developing software for the Apple Macintosh computer led Microsoft into graphics-intensive software, setting the stage for Microsoft applications and its breakthrough Windows 95 operating system.

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You can, however, create a system that maximizes the probability that a breakthrough can occur.

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We need a breakthrough such that our hybrid social service system can produce better results at lower costs.

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The choice of Mr Yanukovich as president would be neither a disaster nor a breakthrough for Ukraine's oligarchic political system.

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The company's breakthrough solution, the Nectar Mobile Power System, delivers the only viable small form-factor battery replacement that provides the enormous run-time improvements demanded by today's CE devices.

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With University of Maryland mathematician Doron Levy, he has been studying why the immune system can't wipe out leukemia cells that are missed by the breakthrough drug Gleevec.

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The four-team playoff that will supplant the convoluted system of selecting two teams for college football's championship game was hailed as a breakthrough.

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