Commentary: Most teachers in CPS strike never benefit from pensions that strangle the system — and taxpayers. There’s a better way. – Chicago Tribune

On average, to earn a full pension, a teacher must remain in the same state or district for 25 years — a condition that less than half of teachers nationally will meet. In Illinois, where the vesting period for the pension system is 10 years of employment, only half of new teachers will ever vest in the system. And only 1 out of 5 teachers in Illinois will ever break even from their pension plan.