Mechanical design is to design parts, components, products, or systems of mechanical nature. For example, designs of various machine elements such as levers, sprockets, cams, keys, gears and fasteners fall into the scope of mechanical design.

Mechanical design is the process of developing a machine, product, or mechanical system for functional use. Mechanical design is also used to design specific parts and components. It is sometimes called machine design or engineering design.

Every design decision can make the user experience better or worse. Successful inclusive design requires informed decision-making at the concept stage, because it can become prohibitively expensive to make changes later on.