25 Women in 10 Free Software Organizations for GNOME's Outreach Program for Women

Well, my comment was not meant to be a scientific paper therefore I did not give any citation - similar to my parent poster. By the way - wouldn't it be at first hand the task of those who promote such women-only programs to back up their claim that the relatively low percentage of women in open source projects is a result of active discrimination by men?
Couldn't this gender disproportion be simply the result of gender typical interests? I work as a software developer for quite some years now. In the various groups I worked I had and have female colleagues. Throughout all these years I do not remember any case of sexual harassment or anything that could be seen as a discrimination against women. In fact you could argue that it is quite the opposite now: as a reaction of the political pressure from EU and national government my company has committed itself to increase the percentage of women in managing positions within the next couple of years. So as woman you have actually better chances to be promoted than as a man. But that's another story. What is however striking is that none of my female colleagues seemed to have interest in any software or hardware related stuff in their spare time. No female colleague ever talked to me about her current software hobby project or her latest experiments with her new Raspberry Pi - as my male colleagues occasionally do. Of course this is not a bad thing at all - but related to the question why so few women volunteer for open source projects it might give a hint. The interesting question is whether these differences in interests have their root cause in social traditions or in biological dispositions. For that I finally I have a citation:

"The Gender Equality Paradox"
http://www.youtube.com/watch?v=KQ2xrnyH2wQ