80% of humanity lives on less than $10/day. If you are part of the world's lowest socioeconomic level you may be living on a house that can barely be called that. It's a collection of sticks, cardboard, plastic sheet. A dirt floor, no water, electricity or sewage. Enter frugal innovation or frugal engineering: The process of reducing the complexity and cost of a good and its production. Usually this refers to removing nonessential features from a durable good in order to sell it in developing countries. In this chapter of the "Beyond Stage Gate" series, we explore simple, low cost, effective and proven global design solutions that do not require exotic technology but that when combined can dramatically improve the quality of life of people around the world.