Harvard's shows the way. Bottomline: Penalize the faculty for unduly long PhDs.
A series of new policies in the humanities and the social sciences at Harvard University are premised on the idea that professors need the ticking clock, too. For the last two years, the university has announced that for every five graduate students in years eight or higher of a Ph.D. program, the department would lose one admissions slot for a new doctoral student. The results were immediate: In numerous departments that had for years had large clusters of Ph.D. students taking eight or more years to finish, professors reached out to students and doctorates were completed.