This recommended practice establishes categories of off-road self-propelled work machines. Where possible, this recommended practice shows which standards writing organization - SAE or other - will be responsible for each category for machine identification terminology, component nomenclature, definitions of specification terms, and other standards and recommended practices. This recommended practice applies to machines that are in regular commercial production. Included are the following categories: Construction, General Purpose Industrial, Agricultural, Forestry, Specialized Mining Machinery, Powered Industrial Trucks. In spite of the appearance of the same names, such as tractors and loaders in more than one category, further development of this and related recommended practices will demonstrate that there are differences in the fully-equipped working machine that may require distinction as to intended end-point field usage.