1 INTRODUCTION

2 SAMPLE SELECTION

3 ABUNDANCES

4 PHOTOIONISATION MODELS

5 KINEMATICS OF SUB-DLAS

6 NH-WEIGHTED MEAN METALLICITY
6.1 [Fe/H] Metallicity Evolution
6.2 [Zn/H] Metallicity Evolution and Survival Analysis

7 AVERAGE SUB-DLA SPECTRUM

8 THE CONTRIBUTION OF SUB-DLAS TO THE METAL BUDGET OF THE UNIVERSE

9 DISCUSSION AND CONCLUSIONS