Atlanta has companies dealing with ergonomics issues. Ergonomics itself refers to design suitable for human body, its capabilities and cognitive abilities. These companies analyze products for regulatory compliance, product safety standards and liability issues. It is defined by the International Ergonomics Association as "Ergonomics (or human factors) is the scientific discipline concerned with the understanding of interactions among humans and other elements of a system, and the profession that applies theory, principles, data and methods to design in order to optimize human well-being and overall system performance." These companies analyze products for regulatory compliance, product safety standards and liability issues. They use customized test equipment for running the tests. They also sell products that help standardize and check for compliance factors in various fields, such as accessibility, acoustics, electrical standards, EMI/EMC, environmental, force flammability, impact, materials, safety standards and torque. Product calibration services may alos be available in Atlanta.