Extensive education research on the contribution of teachers to student achievement produces two generally accepted results. First, teacher quality varies substantially as measured by the value added to student achievement or future academic attainment or earnings. Second, variables often used to determine entry into the profession and…

To carry out this study, personal interviews were conducted with licensing personnel in the geographically diverse states of New York, California, Florida, Illinois, and Texas. The nonprofessional occupations (those requiring not more than two years of post-high school training) examined for licensing requirements in at least one of the five…