This recommended practice applies to machines that are in regular commercial production. Included are the following categories:

1. Construction
2. General Purpose Industrial
3. Agricultural
4. Forestry
5. Specialized Mining Machinery
6. 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. These differences include:

1. Names of optional implements.
2. Names of components of optional implements.
3. Definitions of specification terms as affected by installed optional implements.
4. Different mounting provisions on the machines for implements and other attachments.
5. Differences in design to achieve objectives for performance, durability, or operator or public safety.