Embedded software company Green Hills Software maintained a silver composite performance for a year and was presented with Boeing’s 2011 Performance Excellence Award. This year Boeing recognised 529 suppliers who achieved either a gold or silver level. Green Hills Software is one of 407 suppliers to receive the silver level of recognition.For ten years Green Hills Software has provided systems for mission-critical product lines within Boeing. The contributions of Green Hills Software include software development tools, operating systems and related middleware, and certification and other consulting services.