Appendix to 29 CFR Part 1630—Interpretive Guidance on Title I of the Americans With Disabilities Act

Section 1630.2(n)   Essential Functions

The determination of which functions are essential may be critical to the determination of whether or not the individual with a disability is qualified. The essential functions are those functions that the individual who holds the position must be able to perform unaided or with the assistance of a reasonable accommodation.

The inquiry into whether a particular function is essential initially focuses on whether the employer actually requires employees in the position to perform the functions that the employer asserts are essential. For example, an employer may state that typing is an essential function of a position. If, in fact, the employer has never required any employee in that particular position to type, this will be evidence that typing is not actually an essential function of the position.

If the individual who holds the position is actually required to perform the function the employer asserts is an essential function, the inquiry will then center around whether removing the function would fundamentally alter that position. This determination of whether or not a particular function is essential will generally include one or more of the following factors listed in part 1630.

The first factor is whether the position exists to perform a particular function. For example, an individual may be hired to proofread documents. The ability to proofread the documents would then be an essential function, since this is the only reason the position exists.

The second factor in determining whether a function is essential is the number of other employees available to perform that job function or among whom the performance of that job function can be distributed. This may be a factor either because the total number of available employees is low, or because of the fluctuating demands of the business operation. For example, if an employer has a relatively small number of available employees for the volume of work to be performed, it may be necessary that each employee perform a multitude of different functions. Therefore, the performance of those functions by each employee becomes more critical and the options for reorganizing the work become more limited. In such a situation, functions that might not be essential if there were a larger staff may become essential because the staff size is small compared to the volume of work that has to be done. See Treadwell v. Alexander, 707 F.2d 473 (11th Cir. 1983).

A similar situation might occur in a larger work force if the workflow follows a cycle of heavy demand for labor intensive work followed by low demand periods. This type of workflow might also make the performance of each function during the peak periods more critical and might limit the employer's flexibility in reorganizing operating procedures. See Dexler v. Tisch, 660 F. Supp. 1418 (D. Conn. 1987).

The third factor is the degree of expertise or skill required to perform the function. In certain professions and highly skilled positions the employee is hired for his or her expertise or ability to perform the particular function. In such a situation, the performance of that specialized task would be an essential function.

Whether a particular function is essential is a factual determination that must be made on a case by case basis. In determining whether or not a particular function is essential, all relevant evidence should be considered. Part 1630 lists various types of evidence, such as an established job description, that should be considered in determining whether a particular function is essential. Since the list is not exhaustive, other relevant evidence may also be presented. Greater weight will not be granted to the types of evidence included on the list than to the types of evidence not listed.

Although part 1630 does not require employers to develop or maintain job descriptions, written job descriptions prepared before advertising or interviewing applicants for the job, as well as the employer's judgment as to what functions are essential are among the relevant evidence to be considered in determining whether a particular function is essential. The terms of a collective bargaining agreement are also relevant to the determination of whether a particular function is essential. The work experience of past employees in the job or of current employees in similar jobs is likewise relevant to the determination of whether a particular function is essential. See H.R. Conf. Rep. No. 101-596, 101st Cong., 2d Sess. 58 (1990) [hereinafter Conference Report]; House Judiciary Report at 33-34. See also Hall v. U.S. Postal Service, 857 F.2d 1073 (6th Cir. 1988).

The time spent performing the particular function may also be an indicator of whether that function is essential. For example, if an employee spends the vast majority of his or her time working at a cash register, this would be evidence that operating the cash register is an essential function. The consequences of failing to require the employee to perform the function may be another indicator of whether a particular function is essential. For example, although a firefighter may not regularly have to carry an unconscious adult out of a burning building, the consequence of failing to require the firefighter to be able to perform this function would be serious.

It is important to note that the inquiry into essential functions is not intended to second guess an employer's business judgment with regard to production standards, whether qualitative or quantitative, nor to require employers to lower such standards. (See §1630.10 Qualification Standards, Tests and Other Selection Criteria). If an employer requires its typists to be able to accurately type 75 words per minute, it will not be called upon to explain why an inaccurate work product, or a typing speed of 65 words per minute, would not be adequate. Similarly, if a hotel requires its service workers to thoroughly clean 16 rooms per day, it will not have to explain why it requires thorough cleaning, or why it chose a 16 room rather than a 10 room requirement. However, if an employer does require accurate 75 word per minute typing or the thorough cleaning of 16 rooms, it will have to show that it actually imposes such requirements on its employees in fact, and not simply on paper. It should also be noted that, if it is alleged that the employer intentionally selected the particular level of production to exclude individuals with disabilities, the employer may have to offer a legitimate, nondiscriminatory reason for its selection.