The Small Business Jobs Act of 2010 (Jobs Act) requires SBA to conduct every five years a detailed review of all size standards and to make appropriate adjustments to reflect market conditions.  As part of the second five-year review of size standards under the Jobs Act, in this proposed rule, SBA will evaluate each industry that has a receipts-based standard in North American Industry Classification System (NAICS) Sector 11 (Agriculture, Forestry, Fishing and Hunting), Sector 21 (Mining, Quarrying, and Oil and Gas Extraction), Sector 22 (Utilities), and Sector 23 (Construction), and make necessary adjustments to size standards in these sectors.  This is one of a series of proposed rules that will examine groups of NAICS sectors.  SBA will apply its Size Standards Methodology to this proposed rule.