Employee English class is as much about worker safety as it is about improving communication. Typically, blue collar manufacturing businesses tend to hire more ESL workers (who speak English as a Second Language). As a business owner, you have a responsibility to provide every worker with a safe working environment. Usually this means going over the safety trainings again, having proper signage throughout the workspace etc. Business owners and decision makers should be prepared to take additional steps to ensure worker safety. If an ESL employee is struggling with pronunciation, how can they communicate to the rest of their team? If they can't understand terminology needed for their job, how can you trust they can follow instruction? Especially in big factories, communication is as much about safety as any other protocol you are required to follow.