A "Registered Apprenticeship" (RA) is an effective "earn and learn" model with a long history of providing career ladders and pathways to the middle class, particularly for the building and construction industry but increasingly in other industries as well. Registered Apprenticeships must be registered with the U.S. Department of Labor, and have five components: business involvement, structured on-the-job training, related classroom and workplace instruction, rewards for skills gains, and an industry recognized credential at the successful completion of training.