1 Introduction  
2 Brief Review of Phase Curves  
2.1 Review of Previous Phase Curve Measurements  
2.2 Trends from Past Measurements  
2.3 What to Expect from JWST  
3 Science Questions for Ariel Phase Curves  
4 Target List and Observing Strategy  
4.2 Observational Strategy  
4.3 Phase Curves of Reflected Light and Synergy with TESS, CHEOPS and PLATO  
5 Simulations  
5.1 Phase Curves Calculated from a Global Circulation Model  
5.2 Effect of Systematics and Retrieval of Photometric Phase Curves  
5.3 Retrieval of Spectroscopic Phase Curves  
6 Summary and Conclusions