Industrial engineering deals with optimizing complex processes and systems. It involves integrating people, equipment, materials, and processes to specify, evaluate, and improve manufacturing or service systems. Industrial engineering is the third largest engineering discipline in the US, with expected job growth of 5% by 2022. Common industrial engineering roles include manufacturing engineering, quality control, facility design, and work design. Six sigma and project management software are important technologies for industrial engineers. New technologies like proton beam cancer treatment require industrial engineers to help develop, optimize, and commercialize the systems.