The electronic reporting requirements are based on the size of the establishment. The OSHA injury and illness records are maintained at the establishment level. An establishment is defined as a single physical location where business is conducted or where services or industrial operations are performed. A firm may be comprised of one or more establishments. To determine if you need to provide OSHA with the required data for an establishment, you need to determine the establishment's peak employment during the last calendar year. Each individual employed in the establishment at any time during the calendar year counts as one employee, including full-time, part-time, seasonal, and temporary workers.