Actually...yes. There is an ongoing effort, for example, to get more male nurses.
And this is really more about missing out on potential contributors.
Going off of what was said about creativity, I've read that women tend to think of the computer as a tool, or a means to an end... I don't think the current stereotype that you need to be antisocial and obsessed with hardware is helping any. Computers aren't seen as "creative" or "artsy" but more "science." Getting the message out there that creativity and computing DO go together is important, IMO.
Bookmarks