Electronics engineers plan, build, and evaluate electronic components modules and systems. Such engineers concentrate mainly on vehicle control systems and other computer equipment. They differ from electrical engineers in that they do not focus on the generation and distribution of electricity. Industrial engineers define the most efficient ways of utilising the essential elements of production — people, equipment, products, knowledge, and energy — to produce automobiles. They are mainly concerned with growing efficiency by human resources, the usage of technologies, and the development of manufacturing processes.