Abilities of People With Disabilities Assumption: A person with mental retardation cannot be trained to perform a job as well as an employee without a disability. Fact: Over two thirds of Pizza Hut employees have mental retardation. The average turnover rate (the rate at which workers quit) of these employees is a modest twenty percent compared to a one hundred and fifty percent turnover of employees without disabilities. It is this kind of thinking that limits the ability of people with disabilities to find employment more than any other factor. In an E-Mail on Thursday, November 7, 1996, Barbara Sommer, Disabilities Employment Coordin