LOOKING BACK over the last 30 years, it is impossible not to be impressed by the enormous revolution that has occurred in a relatively short time. Before 1970, few women held workplace positions of public power or authority. Only a handful had jobs in the top ranks of large companies, and even fewer were members of Congress or in Cabinet or top judicial positions. Women reporters worked in the newsroom, but almost none held positions of editorial responsibility at the most prestigious newspapers or appeared on television as anchor or even reporter on the evening news. Almost half of all college-educated women did not work, and those who did tended to be concentrated in nursing, ...