QUESTION 1 The significant problems we face cannot be solved at the same level of thinking we were at when we created them. Albert Einstein, 1879-1955. Against the pretext: 1. Interpret rethinking in the context of recycle of materials for products development. (AP-5) 2. What is the rigid dichotomy between modelling and technology choices in product design? (AN-5) 3. Value the re-design model in the context of economic efficiency assessment. (EV-5) 4. What technology choice is suitable for the design of aircraft?