A worker who has not been trained—either through classroom or on-the-job instruction—may not be able to recognize and avoid all potential hazards associated with the task he or she is performing. To ensure that a worker is properly trained, several factors are necessary. First, the individual(s) responsible for a worker’s training must have expertise in the task being performed. (If he or she does not fully understand the desired end result of a task and the materials, equipment, and process used to achieve the end result, how can he or she adequately assess whether a worker is trained properly?) Second, the entity must have expertise in the required training requirements for the specific task being performed, which requires a working knowledge of the relevant portions of the OSHA text that apply to the task (for example, many competent journey-level workers are not aware that 29 CFR 1926 Subpart X identifies specific training requirements on the proper use of ladders).