Modelling and quantification of Eco-functional Index: The concept and applications of eco-functional assessment

► The very new concept and framework of eco-functional assessment to derive Eco-functional Index were proposed. ► An eco-functional model with specific inputs and outputs has been developed. ► Eco-functional assessment system along with eco-functional indices was proposed. ► Eco-functional indices of 23 types of shopping bags were assessed by the developed eco-functional model.