The practice of assembling products on a production line. Assemblers can have responsibilities ranging from relatively simple to very complicated. Assemblers may be required to help piece together complex machinery and read detailed blueprints. Prior to assembling pieces, they may have to make adjustments to some components so everything fits correctly. Also, assemblers must know how to repair the machinery used during product assembly. Assemblers use their hands, tools or machines to assemble parts, and they must be alert for defects that may reduce product quality. Assemblers help make toys, calculators, cell phones, alarm clocks, computers, engines and many other items.

An assembler is responsible for the safe and efficient operation of machinery. Due to advancements in technology, this could mean anything from operating a forklift to using robots or programmable motion-control devices. All assemblers must follow their company's standard operating procedures.

Companies may require assemblers to specialize in a specific task, or they may place assemblers in teams where tasks are rotated periodically. In either case, an assembler should be prepared to stand or sit for long durations. Assemblers must be able to work and communicate with other people. They also must be capable of basic reading, writing and math. Dexterity is an important skill that is needed to use the required tools and keep up with the flow of the production line.

Depending on the complexity of the work, assemblers may only need a diploma or GED, or they may be required to possess an associate degree. Assemblers may be provided with on-the-job training.