This U.S. industry comprises establishments primarily engaged in offering apprenticeship training programs. These programs involve applied training as well as course work.

Including:

• Apprenticeship training programs
• Carpenters' apprenticeship training
• Craft union apprenticeship training programs
• Electricians' apprenticeship training
• Mechanic's apprenticeship training
• Plumbers' apprenticeship training
• Sheet metal workers' apprenticeship training
• Steam fitters' apprenticeship training
• Trade union apprenticeship training programs
• Vocational apprenticeship training