Nearly one in four of all employed U.S. workers are in a profession that requires an occupational license, making licensing one of the central factors that shapes employment opportunities for many workers. AIR worked with the National Conference for State Legislatures (NCSL) and its partner organizations, the Council of State Governments and the National Governors Association's Center for Best Practices, to conduct case studies of 11 different states that undertook efforts to review their licensing practices.