1. INTRODUCTION

2. OBSERVATIONS AND DATA REDUCTION  
2.1. The Red-Sequence Cluster Survey Sample  
2.2. Spitzer Imaging: MIPS 24 µm and IRAC 3.6/4.5 µm  
2.3. Source Detection and Photometry Catalog  
2.4. Background Comparison Field: SCOSMOS

3. ANALYSIS: GALAXY COUNTS AND BACKGROUND SUBTRACTION

4. DISCUSSION  
4.1. The evolution of the IR-luminous galaxy population in clusters  
4.2. The dependence of star formation on cluster mass

5. CONCLUSIONS AND FINAL REMARKS