When accommodations are objectively based upon the documented evidence of functional limitations due to disability, they simply compensate for the aforementioned limitation, and therefore are not advantageous. If the disability and/or its functional manifestations were falsely identified, accommodations would likely be unfair due to the fact that they were not warranted. Studies have shown that when given extended time on tests, the grades of students without disabilities are not significantly improved beyond those which they achieved with normal time. However, extended time was demonstrated to significantly enhance the grades of students with disabilities necessitating this accommodation. Accommodations are designed to meet the needs of the student in a particular learning environment. Thus, the "Request for Accommodations" has an expiration date and must be renewed each semester.