In 1977 forty-six women served on the boards of Fortune 500 Companies. Today 600 women serve on the boards, with more than 40% of them rising to those positions from the corporate ranks. That’s up from 22% in 1983 who got to the boards from go vernment or university positions. Their history with the companies makes them more likely candidate for CEO positions. Though no Fortune 500 Companies have women CEOs yet, their presence on the boards and their history with their companies is hel ping to crack the glass ceiling.