How can the new science of happiness add value to development theory and practice? While the topic of subjective well-being (SWB, i.e. people’s self-reported life satisfaction and happiness) has recently attracted much attention in rich nations where economic growth over the past 60 years has not led to rises in average happiness, the potential of SWB in a development context remains underexploited. To illustrate one innovative way of using SWB data in such a context and outline their possibilities to the development community, this paper considers conventional development wisdom through a life satisfaction lens. The Human Development approach with its three key elements - material conditions, health and education - is reassessed by examini...