The document outlines an agenda for a professional development series on the CLASS (Classroom Assessment and Observation Scoring System) tool. The agenda includes: - An 8:30-9:30AM introduction to the CLASS tool. - A 9:30-11:00AM session on concept development and "Stretching the Muscles of the Brain". - A 12:00-1:30PM session on quality of feedback and "Asking Questions and Feedback Loops". - A 1:30-3:00PM session on language modeling and "Using Advanced Vocabulary with Children as a Part of the Project Approach".