In which unit would the procedures for providing medical assistance be established?

The correct choice is the Medical unit as it specifically focuses on the procedures for providing medical assistance during an incident. Within the framework of the National Incident Management System (NIMS), the Medical unit is responsible for coordinating medical services, which includes managing treatment, transportation, and resources related to healthcare during an emergency.

The Medical unit operates under the Operations Section of the Incident Command System (ICS), ensuring that medical needs are appropriately addressed and resources are utilized effectively to provide care for the injured or ill during an incident. This unit works closely with other units to ensure a comprehensive approach to health and safety.

In contrast, the Cost unit deals primarily with financial aspects of incident management, the Time unit tracks time-related data and resources, and the Supply unit manages the ordering, storing, and distribution of all materials and supplies needed for the incident. Each of these units has distinct roles that do not overlap with the provision of medical assistance, thereby highlighting the Medical unit's essential role in incident response.