1 INTRODUCTION

2 THE DATA

3 METHOD: THE SCATTER-AGE TEST

4 THE SCATTER IN THE COLOUR-MAGNITUDE RELATION
4.1 The CMR scatter for different clusters
4.2 CMR scatter dependence on galaxy properties

5 STAR FORMATION HISTORIES
5.1 Star-formation histories of the early-type galaxies in each cluster
5.2 Dependence of the star-formation histories on galaxy properties

6 THE CMR ZEROPOINT

7 DISCUSSION AND CONCLUSIONS