Can large groups of individuals, who haven't even met each other, design stuff?
The Linux project suggests that they can!
Linus Torvalds created the first form of the open source Linux software with the assistance of developers around the world and it continues to be modified. Changes are tested by many users; the beneficial improvements survive the peer review and become widely adopted, so the software evolves. Most of this development is done free of charge by people with various motivations. Perhaps they want recognition, the satisfaction of solving a problem or to display their skills to prospective employers. These may also be motivations for people to get involved with Interactive Democracy to design new laws and policies.