Employers need to ensure their supervisors are properly trained, not just on substantive aspects of safety such as proper fall protection and lockout/tagout procedures, but on basic understanding of all worksite hazards and how to effectively communicate with employees to look out for hazardous situations and protect themselves.
Health and Safety manuals are designed to provide employers with the necessary instruction to protect their employees, company, and themselves. Ignorance will not be a viable excuse as a supervisor when OSHA comes before or after an accident.