NAIC's voluntary accreditation program has existed now for more than 10 years. During this time, the program has demonstrated its value by defining a common set of basic regulatory requirements for solvency regulation and successfully engineering their adoption by nearly all states. Currently, 47 state insurance departments and the District of Columbia are accredited through NAIC. In the years since its inception, NAIC has moved to improve and strengthen its accreditation program by adding model laws and regulations to the required standards in order to address the changing environment of the insurance industry and insurance regulation. In addition, it has revised the way accreditation reviews are performed and scored and has improved training for members of review teams.