This volume of DoD 5010.15.l-M, Standardization of Work Measurement, is one of a series published under the authority of DoD Directive 5010.15, Defense Integrated Management Engineering System (DIMES). It provides standard time data for Structural Occupations as classified by Department of Labor codes and includes guidelines for uniform application. Some of the tasks covered in these occupations are assembly of aircraft and vehicles, sheet metal work and welding. Others are oriented to the building trades and include masonry, carpentry, plumbing, and other related occupations. Maximum use of the guidelines and standard time data is mandatory at each Department of Defense activity where Labor Performance Standards are developed and applied. All of the included standard time data have been reviewed and approved by a Joint Service/Agency Standard Time Data Group prior to publication.