This chapter is the second from four chapters, detailing the role of environmental, economic and social impact assessment of WEEE collection and treatment. It forms the second step of a dynamic and iterative e-waste development cycle intended to provide guidance on the complexity of the development process. The chapter also describes detailed assessment steps for evaluating collection and recycling infrastructure for both starting, emerging and established countries improving their national e-waste systems. Secondly, the comprehensive impact assessment specifically targets the identification of improvement potential and societal priorities for (re)defining legislative and other interventions. The outcomes form the necessary factual basis for the heart of the development cycle as presented in Chapter 4 describing options for advancing Policy and Legislation, Business and Finance, Technologies and Skills. This in turn is the basis for successful national implementation roadmaps following in Chapter 5.