The term "Professional Engineering" refers to the practice of applying principles of mathematics, physics and other sciences for designing, developing, testing, installing, maintaining and improving structures, machines, devices, systems or processes. This involves using knowledge and skills gained through education, training and experience in engineering disciplines such as mechanical, electrical, civil, chemical, industrial, aerospace, environmental, software, and other branches of engineering to develop innovative solutions for practical problems. Professional engineers are responsible for ensuring that their designs meet safety, health, economic, and sustainability criteria while considering the social, cultural, and environmental impacts of their work. They often work in teams with architects, scientists, and other professionals to achieve common goals. The practice of professional engineering is regulated by law and requires licensure or certification in most jurisdictions.