It depends what you mean by "work." You can certainly mandate that 50% of your engineering staff be women. But bad things are probably going to happen, because far fewer women go into engineering disciplines than men. Instead of getting the best 5% of the available pool, now you are forced to take a higher % of female candidates, regardless of their level of competence. It works the other way too: the HR field is dominated by women, but if you mandate equality, then you are scraping the bottom of the barrel to fill those positions with men. Similar issues with hiring by race, etc. Once competence stops being the main criteria for hiring, planes start falling out of the sky, eventually.