The richest lessons on quality rating and improvement system (QRIS) development and implementation come from the states and communities that have been built upon the experiences of others that have come before them. The Quality Compendium, which details and compares quality initiatives, allows you to view a state profile, create a report, or view top trends. The site includes master files from past years, resources, and other information. You also may explore the National Center on Early Childhood Quality Assurance's Quality Rating and Improvement System Fact Sheets, which are generated using data from the Quality Compendium. The most recent data were collected during the fall of 2021 and will be posted at the beginning of 2022. The last data collection occurred during the fall of 2019.