Okay, HN - forget the surveys and methodology. Your actions will be local, so your data will be too. Take a look around you, in your workplace. Are there actually any female developers working alongside you? How about in engineering management, and at the executive level?

The problem is there. It's staring you in the face. The tech industry has not offered the same opportunities to women as it has to men.

Act now and solve it. Don't wait for that perfectly conducted longitudinal study, covering a representative sample of women entering the industry and their experiences ten years later. You don't need it to see what's happening.