The aim of our study is to propose manufacturers and users have to do for building a sustainable zero-waste economy/society through quantification of the design for environment, DfE. For a background problem of global warming and depletion of natural resources, it is required to reduce the environmental impacts of the products and services life cycle and to develop the method for quantifying the environmental impacts. Following such a demand, the Eco-Efficiency Potential Assessment, E2-PA which could solve problems in existing LCA, is developed. The feature of E2-PA is to be able to assess the environmental impacts only by the data on the design phase of products and services. Therefore the designer can consider the life cycle including used on the design phase. In this paper, we pay attention to home appliances and ICT devices. Then, we analyze the way of reducing the environmental load about them through a comparison between the environmental load in use and in manufacturing.