SCHEDULE LISTINGS are a type of record-keeping that involves organizing and tracking APPOINTMENTS, events, and deadlines. APPTS (5 letters) stands for 'APPOINTMENTS, ' which are meetings or engagements that have been arranged in advance. ETDS (4 letters) stands for 'events, tasks, and deadlines, ' which are activities that need to be completed by a certain date. Together, SCHEDULE LISTINGS provide an efficient way to keep track of important dates and times.