A comprehensive high school in Bellevue, Washington, embraces problem-based learning as its strategy for improvement. Supported by a federal i3 grant, the school spent five years preparing for a widespread launch of PBL at the school. After several years of implementation, researchers learned that students perform the same or better on standardized measures when provided with sustained, rich PBL learning experiences. Those benefits were felt by all students, regardless of socioeconomic or linguistic status, or special learning needs.