This document discusses professional learning communities (PLCs) and their key components. It outlines the four questions PLCs aim to answer about student learning and lists important foundations like having a shared mission and commitment to continuous improvement. PLCs are meant to impact classroom practice through collaboration, using common assessments and instructional practices, and addressing student needs. Sustainable school change involves addressing not just surface-level strategies but also deeper organizational structures, relationships, and identity. Leadership in PLCs should focus on facilitation, asking questions, and adding value through resources and support.