The Master’s programme Industrial Ecology is jointly organised by Leiden University and Delft University of Technology. Companies need new business models to grasp the opportunities of a circular economy. This thesis investigates to what extent existing frameworks, methods and tools for business model innovation are useful to cope with the challenges of designing and implementing circular business models. To innovate towards a circular business model, the use of a new framework and tool is recommended. The Circular Business Model Innovation framework outlines a process of 18 typical obstacles – or challenges – which should be taken into account. The Business Cycle Canvas supports practitioners to think in systems and develop supply chains with a closed material loop, one the most important challenges when designing a circular business model.