An intrastate case can become an interstate case at any time. Or it may become an intergovernmental case involving a tribe or foreign country. All child support professionals must know the basics of the Uniform Interstate Family Support Act (UIFSA). UIFSA is the law states use to process intergovernmental cases. UIFSA has one-state and two-state remedies for establishing, enforcing, and modifying support orders. Understanding its procedures, jurisdiction provisions, and choice of law rules is critical for child support professionals to provide the most appropriate service to families.