What does "must be in writing" imply about emergency action plans?

The phrase "must be in writing" indicates that the emergency action plans need to be formally documented. This documentation ensures that there is a clear, accessible reference for all employees regarding the steps to take in the event of an emergency. Written plans provide consistency, accountability, and a way to effectively train personnel on the procedures they need to follow, thus enhancing safety in the workplace. Having these plans in writing allows all team members to understand their roles and responsibilities, and it helps in meeting regulatory requirements that mandate such documentation in many jurisdictions.