Chapter 2: Special Considerationsfor Cycle 21 2.1 STIS Repair and Return to Operations 2.2 Summary of STIS Performance Changes Since 2004 2.3 Use of Available-but-Unsupported Capabilities 2.4 Should I Use COS or STIS? 2.5 Scheduling Efficiency and Visit Orbit Limits 2.6 MAMA Scheduling Policies 2.7 Prime and Parallel Observing: MAMA Bright Object Constraints 2.8 STIS Snapshot Program Policies