1 INTRODUCTION

2 GALAXY GROUP FINDING

3 SCIENCE METRICS FOR PERFORMANCE ESTIMATION

4 PERFORMANCE OF "HALO-BASED" AND FoF METHODS AT LOW REDSHIFT

5 PERFORMANCE OF FoF CATALOGUES AT HIGH REDSHIFT IN $s/M_{\mathrm{star}}$-SPACE

6 SURVEY COSTS ANALYSIS IN $\textbf{N}s/M_{\mathrm{star}}$-SPACE

7 SUMMARY AND CONCLUSION