At American colleges and universities the number of position that offer the job security of tenure has been shrinking for year.tenure is meant to give professors greater freedom to teach, write or study subjects that might not be popular or politically correct. But critice say tenure can keep school form dismissing unproductice faculty members or problem employees.Another complaint is that it can restrict the ability to make changes in programs or make the best use of limited budgets.The number of tenured position at U.S.colleges and university has been decreasing since the 1970s.None Curtis is the director of research and public policy at the American association of university professors. He says that only about 25 percent of faculty member have tenure or are in a position that might lead to tenure. The association says that at least 85 percent of faculty members. Should have tenure or be able to seek it. He says this will protect independent thought and freedom of speech. But a recent survey found that many colleges and universities plan to employ fower tenured professors. The study was done by the Gallup organization and the online publication inside higher ed. The survey asked more than 1000 college and university officials about their hiring plans. The results suggest that tenured positions might continue to decrease. More than 58 percent of chief academic officers at U.S. public universities agreed that future generations of faculty should not expect tenure. More then 53 percent of privats school officials agreed.