Nowadays product-oriented companies are facing the need to focus on the service rather than the product alone. By following a Service-Dominant Strategy, we need to focus on the ecosystem embodying the collaboration to provide such a service. This collaborative perspective on value creation and value sharing is the foundation for designing new business models within the ecosystem. We take the lessons learned in the car-leasing domain on the development of a Service-Dominant Strategy to design a tool supporting the transition from product focus to Product-Service ecosystems.