Staffing of work that is “blue collar” in nature, typically requires physical activity or operation of machinery and falls outside of office/clerical staffing. Common job titles in the manufacturing setting include assembler, operator and skilled trades worker (welder, electrician, etc.). Common job titles in the warehouse and distribution setting include shipping and receiving clerk, material mover, picker and packer, and forklift operator. Other common job titles include construction laborer, truck driver, janitor, cook, waiter/waitress, security guard and personal care aide. Roughly corresponds to the following US BLS groups: Building and Grounds Cleaning and Maintenance Occupations; Construction and Extraction Occupations; Farming, Fishing, and Forestry Occupations; Food Preparation and Serving Related Occupations; Installation, Maintenance, and Repair Occupations; Production Occupations; Protective Service Occupations; and Transportation and Material Moving Occupations. Roughly corresponds to the following ISCO groups: Skilled Agricultural, Forestry and Fishery Workers; Craft and Related Trades Workers; Plant and Machine Operators, and Assemblers; and Elementary Occupations.