Amends the Courses of Study Article of the School Code. Provides that, beginning with the 2027-2028 school year, the State Board of Education shall establish a pilot program in 5 school districts requiring pupils in prekindergarten through grade 12 to receive developmental etiquette education. Provides that, beginning with the 2028-2029 school year, every school district in this State shall require pupils in prekindergarten through grade 12 to receive developmental etiquette education. Sets forth the grades and instruction for developmental etiquette education, and requires feedback and evaluations. Provides that, beginning with the 2028-2029 school year, as a prerequisite to receiving a high school diploma, each pupil in grade 12 must, in addition to other course requirements, successfully complete developmental etiquette education.