Function Specific Training, as defined in 49 CFR 172.704, refers to specialized training required for employees involved in the transportation of hazardous materials. This training ensures that personnel are knowledgeable about the specific functions they perform, such as loading, unloading, or handling hazardous materials. It aims to promote safety and compliance with regulations to mitigate risks associated with hazardous materials transportation. Employees must receive this training at least once every three years or whenever there are significant changes in their job functions or regulations.