A Practice Note briefly describing the H-3 nonimmigrant visa classification, used by employers to sponsor foreign nationals to enter the US temporarily as either a trainee or a special education exchange visitor to receive training from that employer. This Note describes the requirements for the trainee program and the special education exchange visitor program, the H-3 validity periods, the requirement for nonimmigrant intent, the H-3 petition process, and how the foreign worker acquires lawful H-3 status.