Tempted to enact English-only rules? Talk with your attorney first. You’ll need a justifiable business reason to establish an English-only rule. Be specific about where and when English is required, such as in all matters pertaining to job performance or during all working hours except breaks. Implement a policy that does not prohibit speaking in other languages at lunch time or on breaks. Inform all employees of your policy and the reason for it. Clearly explain the consequences for breaking the rule. Also distribute a policy forbidding discrimination and harassment based on national origin.