1. Introduction  
2. Photometric Redshifts  
2.1. Context  
2.2. Photometric Redshifts  
3. Galaxy Luminosity Functions  
3.1. Completeness  
3.2. Computation of Galaxy Luminosity Functions  
3.3. Red-sequence and Blue Galaxy Luminosity Functions  
4. Results on Galaxy Luminosity Functions  
4.1. Individual Cluster GLFs  
4.2. Stacked GLFs  
4.3. Evolution of GLFs with Redshift  
4.4. Dependence of GLFs on Cluster X-ray Luminosity  
4.5. Dependence of GLFs on Substructures  
4.6. Cluster Cores and Outskirts  
5. Discussion  
5.1. The Faint End of the GLF  
5.2. Dependence on Environment  
5.3. Evolution of Cluster Galaxy Types with Redshift  
5.4. A Scenario for the Evolution of Clusters  
6. Conclusion