From the website: "Skyline is Chicago Public Schools’ universal PK-12 curriculum, built in partnership with hundreds of CPS teachers. Throughout each and every year, you will see improvements and additions to the resources, based on feedback from teachers and students across the city. Last year (SY22), thousands of teachers used Skyline in their classrooms and hundreds engaged in feedback sessions. Their feedback directly informed the revisions that you will see this year (SY23)."