GrAT is a scientific association for research and development of Appropriate Technology for developing and developed countries. Since 1986, GrAT has proposed and demonstrated conceptual and practical solutions for sustainable development. We believe the new way of technology development should contribute to the improvement of quality of life, yet, it should be responsible for its social and ecological consequences at the same time. To reach the goal, GrAT conducts the whole processes of R&D project entailing analysis, planning, design, implementation,...