Despite persistent demand for products that satisfy basic human needs, in many last-mile communities market failures prevent the accessibility of such products. One short-term solution is the use of "Do-It-Yourself" solutions that can be locally sourced, disseminated and implemented. Simple technologies like bio-sand water filters, evaporative refrigerators and composting toilets are just a few examples. What place do DIY solutions have in comparative evaluations with ready-made products? How can development practitioners determine whether DIY products will adequately respond to the aspirations of bottom-of-the-pyramid consumers, or if they are simply stop-gap measures?