My son was in the hospital recently and the head surgeon was a woman. Her primary assistant was a woman. The anesthesiologist and her assistant were women. There was a male nurse or two. I'm pretty sure I wouldn't have encountered this situation 25 years ago. I'm sure "biological factors" mean "most women don't go into medicine" because of the years of hard work separated from their families, and they aren't excited…
When talking about masters, where consistently over the last 10 years or so, 56% of the students is female here in Belgium, law, medical and chemistry studies are currently 60%+ female and some studies, like language, biology, crime, pharmaceutical are 70%+ female, arts and psychology 80%+ and pedagogy and logopedic/audiologic over 90%. That are pretty huge gaps, and yet that's not something you hear about that often.
These stats are taken from multiple reports (in Dutch) from a few universities here in Belgium in years ranging from 2010 to 2013 [1] [2], and one report I only have on paper (all with pretty similar results)
Yes there are also many areas where it's more equally divided (surprisingly, mathematics and economics), but I don't think it's necessarily the 'software engineering' field, it's for a large part society. My gf for example studied chemistry, and even if she's a bit of a geek sometimes, she never even considered software engineering/it as a study. And when I asked her why, she said it just doesn't have any appeal to her, although when I taught her to write small scripts in python and some basic HTML she thought that was awesome.
And I know quite a few geeky girls just like her, doing stuff ranging from having studied sexology, veterinary, economics, law, chemistry, ... Only 3 of the ones I knew started in software engineering and 2 never finished. One became a cop, the other switched to medical, and the one that finished her degree now teaches mostly math since she didn't see herself writing software her entire career.
The only way I see to get more women interested in engineering in general, is to get girls interested from a young age. You can't just wave your magic wand around and wish there's a even a 70/30 male/female ratio when only 10% of the software engineering students in the first year is female, and many of them drop out over the years.
[1] https://www.kuleuven.be/diversiteit/pdf/20130927%20Gender%20...
[2] http://www.ugent.be/nl/univgent/waarvoor-staat-ugent/diversi...