This report presents an overview of the history, collective learning, and concluding products of a networked improvement community (NIC) that operated and evolved between 2017 and 2021: the Student-Centered Assessment Network (SCAN). SCAN comprised a group of teachers from three Rhode Island high schools; a coordinating team of researchers, instructional coaches, and communication professionals from the American Institutes for Research (AIR); and other partners and advisers. In this report, we recount how this network originated, the growth and evolution of the network as teachers, researchers, and instructional coaches worked together to sharpen our shared vision for what SCAN was aiming to accomplish and what our organizing principles and work processes would be.