An assembly line is a manufacturing process in which parts are added as the semi-finished assembly moves from workstation to workstation where the parts are added in sequence until the final assembly is produced. By mechanically moving the parts to the assembly work and moving the semi-finished assembly from work station to work station, a finished product can be assembled faster and with less labor than by having workers carry parts to a stationary piece for assembly.

The division of labour is the separation of the tasks in any economic system or organization so that participants may specialize (specialisation). Individuals, organizations, and nations are endowed with or acquire specialized capabilities, and either form combinations or trade to take advantage of the capabilities of others in addition to their own. Specialized capabilities may include equipment or natural resources as well as skills. Training and combinations of equipment and other assets acting together are often important. For example, an individual may specialize by acquiring tools and the skills to use them effectively just as an organization may specialize by acquiring specialized equipment and hiring or training skilled operators. The division of labour is the motive for trade and the source of economic interdependence.