1 INTRODUCTION

2 DATA AND DATA ANALYSIS  
2.1 The spectroscopic dataset  
2.2 The Hubble Space Telescope photometric dataset  
2.3 The ground-based photometric dataset

3 THE CHEMICAL COMPOSITION OF MULTIPLE POPULATIONS OVER THE CHROMOSOME MAPS  
3.1 Type I GCs  
3.2 A universal chromosome map and relation with chemical abundances  
3.3 Search for intrinsic abundance variations among 1G stars  
3.4 Type II GCs  
3.5 Relations with the parameters of the host GC  
3.6 Lithium

4 MORE ON THE CHROMOSOME MAP OF ω CENTAURI  

5 DISCUSSION AND CONCLUSIONS