Whether or not you accept that there are defined differences between the words "coding" and "programming," you should at least be aware of the differences in connotation...especially if you want to keep from hurting the feelings of your friendly neighborhood software developer!
This approach works fantastically up until around the sixth grade, where many students begin to be capable of reading for hours on end. Once past a twenty minute time-span, additional techniques need to be incorporated to properly guide development.
The CEO of Code.org, Hadi Partovi, says that the Hour of Code is "a grassroots movement that includes nearly two-hundred partners," many of whom work tirelessly to bring high quality programming experiences to the public, one hour at a time.
While it's become obvious that access to mentors increases a girl's chances of making it through college with a computer science degree, we need to do more to get girls interested in pursuing those degrees in the first place.