Recent improvements in underwater welding have led to the increased use of wet and dry hyperbaric welding within the marine construction industry. The general acceptance of underwater welding processes has been further advanced by the standardization of methods, procedures, and certification requirements provided by the American National Standards Institute (ANSI)/American Welding Society (AWS) D3.6 Specification for Underwater Welding. A dedicated effort has been made by the AWS D3B Subcommittee on Underwater Welding to pursue all available means to improve the levels of productivity and safety across the underwater welding industry. One approach which has become a priority of the committee is the inclusion of Human and Organizational Factors considerations within the Specifications in the form of an HOF supplementary annex. This paper provides a brief summation of HOF principles, a methodology for developing an HOF Annex for underwater welding, recommended content and structure for such an annex, and a combined qualitative and quantitative procedure for determining the utility of recommended HOF improvement applications.