By AL BAKER

Nearly half of New York City teachers reaching the end of their probations were denied tenure this year, the Education Department said on Friday, marking the culmination of years of efforts toward Mayor Michael R. Bloomberg’s goal to end “tenure as we know it.”
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Only 55 percent of eligible teachers, having worked for at least three years, earned tenure in 2012, compared with 97 percent in 2007.

An additional 42 percent this year were kept on probation for another year, and 3 percent were denied tenure and fired. Of those whose probations were extended last year, fewer than half won tenure this year, a third were given yet another year to prove themselves, and 16 percent were denied tenure or resigned.

The totals reflect a reversal in the way tenure is granted not only in New York City but around the country. While tenure was once considered nearly automatic, it has now become something teachers have to earn.

A combination of factors — the education reform movement, slow economies that have pinched spending for new teachers, and federal grant competitions like Race to the Top that encourage states to change their policies — have led lawmakers to tighten the requirements not only for earning tenure, but for keeping it.

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