Although no law says an organization must have current job descriptions in use, most managers agree they are a useful tool and that job descriptions should be reviewed and revised regularly. The ADA comes close to legislating the need for job descriptions because of its emphasis on the “essential elements” of a job that a person with an impairments may be able to accomplish. Essential elements are those part of a job that, if a person cannot perform them, mean the person cannot do the job. Therefore, many organizations take special care to identify those essential elements as a way of ensuring that ADA violations do not occur.