The American Institute of Certified Public Accountants (AICPA) and the National Association of State Boards of Accountancy (NASBA) have analyzed the current system for gaining practice privileges across state lines and have endorsed a uniform mobility system. This model approach is detailed through the substantial equivalency provision (Section 23) of the Uniform Accountancy Act (UAA). The UAA is an "evergreen" model licensing law co-developed, maintained, reviewed and updated by the AICPA and NASBA. The model provides a uniform approach to regulation of the accounting profession.