Product certification is often required in sensitive industry and marketplace areas where a failure could have serious consequences, such as negatively affecting the health and welfare of the people or person using that product. For example, certification is stringent in aerospace applications, since the demands for low weight tend to lead to high stress on components, requiring appropriate metallurgy and accuracy in manufacturing. Other sensitive product area examples include food, pharmaceuticals, healthcare products, dangerous goods, electrical equipments and products that have RF emissions such as computers and cellular telephones.