Apprenticeship is a unique learning experience that combines on-the-job training and classroom instruction. On-the-job training allows individuals to earn wages while gaining real-world experience. Classroom instruction teaches theory and skill development in a controlled learning environment. Combined, the two instruction processes create a knowledgeable and experienced worker. ABC NorCal is the sponsor of five state and federally-approved apprenticeship programs in the carpentry, construction craft laborer, electrical, painting, and plumbing trades.