Aims: Until now, the success of improved cook stoves (ICS) implementation programs has usually been measured by the number of ICS distributed. Some important research has been conducted to try to determine the effects of the use of an ICS in the user's health, but these studies are expensive and time consuming. Moreover, no evaluations show the impact of the technology in the user's lives. This study seeks to contribute to fill this gap. Scope: By applying cluster analysis techniques to survey data, the most relevant variables that explain adoption and impact were identified. Using these variables, two qualitative indexes are proposed: The adoption index considers the use of the new technology, the level of satisfaction, and the conditions of the stove. The impact index considers the changes in cooking practices and life quality brought about by the ICS. Both indexes are then applied to two implementation programs. The indexes show the differences between the program results and the user's perceptions of each technology. Conclusions: The proposed indexes can be used to measure the success of an ICS implementation program in terms of the benefits perceived by the users of these technologies. (C) 2013 Elsevier Ltd. All rights reserved.