policy activities was mainly focused on the development of re-X (recycling, remanufacturing, reuse, recovery, ...) technology, it soon became clear that the technological capabilities increasingly exceed their implementation. For the transition towards a Circular Economy, different stakeholders have to work together. This shifted attention towards business model innovation as a key leverage for 'circular' technology adaption. Circular business models are business models that are closing, narrowing, slowing, intensifying, and dematerializing loops, to minimize the resource inputs into and the waste and emission leakage out of the organizational system. This comprises recycling measures (closing), efficiency improvements (narrowing), use phase extensions (slowing or extending), a more intense use phase (intensifying), and the substitution of product utility by service and software solutions (dematerializing). Certification Challenges and opportunities Implementing sustainable business practices may have an effect on profits and a firm's financial 'bottom line'. However, during a time where environmental awareness is popular, green strategies are likely to be embraced by employees, consumers, and other stakeholders. Many organisations concerned about the environmental impact of their business are taking initiatives to invest in sustainable business practices. In fact, a positive correlation has been reported between environmental performance and economic performance. Businesses trying to implement sustainable business need to have insights on balancing the social equity, economic prosperity and environmental quality elements. If an organization’s current business model is inherently unsustainable, becoming truly sustainable requires a complete makeover of the business model (e.g. from selling cars to offering car sharing and other mobility services). This can present a major challenge due to the differences between the old and the new model and the respective skills, resources and infrastructure needed. A new business model can offer major opportunities by entering or even creating new markets and reaching new customer groups. The main challenges faced in the sustainable business practices implementation by businesses in developing countries include lack of skilled personnel, technological challenges, socio-economic challenges, organisational challenges and lack of proper policy framework. Skilled personnel plays a crucial role in quality management, enhanced compliance with international quality standards, and preventative and operational maintenance attitude necessary to ensure sustainable business. In the absence of skilled work forces, companies fail to implement a sustainable business model. Another major challenge to the effective implementation of sustainable business is organisational challenges. Organisational challenges to the implementation of sustainable business activities arise from the difficulties associated with the planning, implementation and evaluation of