This rule implements provisions of the National Defense Authorization Act of 2013 (NDAA) pertaining to small business size. This rule amends the U.S. Small Business Administration's (SBA or Agency) program regulations to implement statutory provisions establishing limitations of liability from fraud penalties for individuals or firms that misrepresent business concerns as being small for purposes of Federal procurement opportunities if they acted in good faith reliance upon small business status advisory opinions received from Small Business Development Centers (SBDCs) or Procurement Technical Assistance Centers (PTACs). The rule also amends SBA's regulations to establish the criteria small business status advisory opinions must meet in order to be deemed adequate and specify the review process for such opinions. Finally, the rule further amends SBA's regulations to update the circumstances under which SBA may initiate a formal size determination.