Design for sustainability is becoming a major challenge as reactions to climate change, resource depletion and environmental health recently have widened to include designers, architects, urban planners and the like. It calls for intentional design, redefining products and practices, capable of being reflexive and radical. ‘Sustainability’ is an open concept with different and often conflicting interpretations, thus ‘the definition’ or substantiation of sustainability becomes part of the design process itself. It is a demand for radical changes (transitions) of products, services and practices to meet the challenge of sustainability, accordingly calling for design which addresses structural changes.