Mechanical engineering is one of the broadest engineering disciplines. For example, while an electrical engineer might design the electronics and circuitry of a microwave oven, a mechanical engineer will be involved in specifying the geometries and materials of all the oven parts and how they will be assembled. Another mechanical engineer might be involved in using a computer to perform mathematical analysis, while yet another might set up a laboratory testing rig to verify that the oven will perform as expected. Additional mechanical engineers will then be needed to design the machines that make the oven parts and oversee production to ensure the quality of the final product.