Final answer:
An EC-1 form is often used in workers' compensation claims and is completed by the employee who is injured or ill because of their job and the employer who verifies employment details.
Step-by-step explanation:
The question is asking about the completion of an EC-1 form. This is typically a document related to employment or insurance claims. In the context of workers' compensation insurance, an EC-1 form may refer to a form that is used by employees to file a claim for work-related injuries or illnesses. The two people that usually fill out and complete an EC-1 form would be the employee who is making the claim and their employer. The employee would provide details on the injury or illness and how it is related to their job, while the employer would confirm employment details and any additional information required by the insurance company.