The document discusses the key elements of a professional learning community (PLC) which are focused on continuous improvement to help all students learn at high levels. It states that a PLC is composed of collaborative teams that work interdependently towards common goals and are accountable to each other. A PLC engages in collective inquiry by gathering student data, developing strategies to address weaknesses, implementing and analyzing their impact to determine effectiveness and apply lessons to continuously improve. The document emphasizes that a PLC's efforts must be assessed based on results, not intentions, and that starting the work of a PLC is more effective than preparing to become one.