The Silver Work Index (SWI) intends to complement the AAI with a quantitative index centring on work in retirement age. It is intended to support evidence-informed strategies for dealing with the challenges of an ageing population in organizations. The SWI will allow for a comparison between organizations and promote good practices towards a more active role for older people. This chapter describes the steps of index development, thus laying the groundwork for a new, innovative, meso-level quantitative index that would capture age-friendly employment practices in eight dimensions of good organizational practices. The results contribute to an understanding of how to improve organizational practices involving older employees. Overall, the SWI complements the AAI by focusing on good organizational practices that support the participation of older employees.