This paper aims at establishing a conceptual framework of eco-innovation in order to derive a set of key performance indicators and drivers eligible to assess the eco-innovation performance of firms, sectors and nation states from a business perspective. In order to establish such a set eco-innovation key performance indicators and drivers (EI-KPIs), first of all, rules of indicator development need to be taken into account. Following these rules, the first step before indicator development can take place, is to provide a conceptual framework of the latent variable to be measured ...