An entire body of law has grown out of the phrase "arising out of and in the course of employment". These words refer to the link between the cause of the accident and the employment. To arise out of the employment a nexus must be established between the accident and the employment. "In the course of employment" means that the employee is helping the employer's business goals in doing the activity where the injury occurred. There are several subtopics that have arisen in this body of law.