Secondary training will be an abbreviated version of primary concepts (Table 2), amenable to delivery by text or email messages that are monitored by the researchers. For example, an ergonomic-related text message would state, “During the past week have you worked on adjustable scaffolding?” The apprentice will respond “Yes” or “No.” Apprentices will then receive a follow-up text/email reminding them that keeping work between shoulders and knees reduces wear and tear to their muscles and joints. As a safety voice example, a text message would state, “During the past week, did you speak up to a coworker or supervisor about something you saw that was unsafe?” This would be followed up with, “Speaking up if you see an unsafe work situation can keep you and your coworkers from getting injured.” The texts/emails are meant to reinforce concepts as well as obtain descriptive information about the use of ergonomic interventions in the field.