Rules for design in the developing world:

1. Try living for a week on $2 a day.
2. Listen to the right people.
3. Do the hard work needed to find a simple solution.
4. Create “transparent” technologies, ones that are easily understood by the users, and promote local innovation.
5. Make it inexpensive.
6. If you want to make something 10 times cheaper, remove 90 percent of the material.
7. Provide skills, not just finished technologies.