Assembly lines are designed for one reason: to make a product. Anything less is unacceptable; anything more is unnecessary. Maintaining this tight focus through design and implementation allows engineers to create the most efficient and effective layout possible.

Fewer parts in a product means less time to assemble the object. Design for Assembly (DFA) is a design process or concept where a product contains as little parts as possible. With a minimal number of parts, it is easier to assemble a product but also timesaving, which in return saves in costs. DFA can lead to improvements in the reliability and quality of the product as the product is produced to last for a long period.

We do have to think small to be able to reduce parts of an existing product. Think of components such as screws and fasteners. Screws and fasteners are not expensive, but they do become expensive when having to handle them when taking a product apart.