Work Fields
Chapter 4 of the 1991 Revised Handbook for Analyzing Jobs (RHAJ) defines Work Fields:
Work fields, a component of work performed, are categories of technologies that reflect how work get done and what gets done as a result of the work activities of a job: the purpose of the job. There are 96 worker fields identified for use by the USES for classification of all jobs in the economy in terms of what gets done on the job.
Work fields range form the specific to the general and are organized in to homogeneous groups, based on related technologies or objectives, such as the movement of materials, the fabrication of products, the use of data, and the provision of services. Each Work field is identified by a three digit code, a brief descriptive title, and a definition. In many cases a comment is included which enlarges upon the definition and limits or extends the application of the work field. Also, cross-references are frequently included which distinguish one Work Field form other related Work Fields.
Combination Work Fields are general categories of work fields that contain combinations of work fields to cover jobs involving various technologies. For example, structural fabricating-installing-repairing includes combinations of such specific work fields as abrading, nailing, riveting, and welding. However, in some situations, the analyst may elect to assign the specific work fields, rather than a combination of work fields, to express the overall objective of a job.
SkillTRAN presents these Combination Work Fields in a slightly modified format here.