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If I was making the decisions, and we didn't have this mullahocracy, I would only put restrictions on fields where women have shown a disinterest in working after obtaining their degrees. If women are consistently obtaining degrees in mining and then not working in the field for obvious reasons, then universities need to change their entrance qualifications and make them more in favour of men. But in other areas where both men and women can work in, I would say tough luck guys, either get your **** together or go become a mechanic.
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I see what you are saying. We did something similar in Pakistan some years ago.
Girl seats in medical colleges were reduced when people noticed that many many woman graduates from medical college were not practicing as doctors few years after their graduation.
Now I am not sure about Iran, but in Pakistan, taxpayers used to finance 100% of higher education (recently it is less than 100% because many private schools offering degrees that you have to pay for).
Thus for a poor country like Pakistan to spend $millions on a female doctor, and then seeing her ditch the profession few years later was pretty disheartening when medical doctors are in HUGE short supply.
However such "gender based" policies turned out to be unpopular and counter-productive.
Why?
Well both boys and girls tend to change the field of their profession, or leave Pakistan altogether.
See you can't engineer and control human beings.
Therefore such policies are wrong.
And in Pakistan they did end up canceling such "girl-specific" rules. ,
peace.
p.s. Another option is to make students pay for their education perhaps based on government backed loans. And then they have to work X number of years to pay it back. This will ensure that both girls and boys serve their nation or at least pay back financially.