informal user group. High-performance windsurfing involves acrobatics such as jumps and Autor: Eric von Hippel Copy Quote More from Eric von Hippel “high-performance windsurfing techniques and equipment in Hawaii by an informal …” “1978 Jurgen Honscheid came over from West Germany for the first Hawaiian World …” “the Sources of Innovation: The Case of Scientific Instruments." Research Policy…” “Then I remembered the "Chip," a small experimental board we had built with foot…”