Our lives are filled with devices that rely on electromagnetic signals: cell phones, medical equipment, military and space systems, power systems, and more. The engineers that design, repair and improve these systems rely on computer models to understand how electromagnetic signals behave in complex environments. ECE researchers working in this area are developing new and improved computer modeling methods and software tools. Applications include designing better communication systems for submarines, spacecraft, or consumer electronics. Even a small amount of improvement in the accuracy and speed of electromagnetic software models can make a huge difference in the capabilities of the resulting applications and products.