What are the limitations of time studies?

What will be an ideal response?

Time standards should not be used to set standards for jobs in which the nature of the task is different each time, such as a student solving a problem, a professor preparing a lecture, or an automobile mechanic diagnosing the cause of a nonroutine problem. In addition, an inexperienced person should not conduct time studies because errors in recording information or in selecting the work elements to include can result in unreasonable standards. Finally, some workers may object to time studies because of the subjectivity involved. Time studies are an imperfect, tool for setting equitable time standards, but when conducted by an experienced observer, provide satisfactory results.