Projects introducing improved stoves that save firewood and reduce emissions and indoor smoke address real needs but have often not succeeded as expected. One of the reasons may be that lessons have not been learnt effectively. We reviewed the only available comprehensive list of principles for stove project design. We modified it, and added more principles based on literature and our own experience. Our list consists of 20 principles covering the areas of awareness creation of multiple benefits, stove design and variety, participation of the beneficiaries, production modes, role of subsidies, and the necessity of accurate assessments and reporting.