I. INTRODUCTION  
II. APPLICATIONS OF LOCALIZATION IN 6G WIRELESS SYSTEMS  
III. LOCALIZATION USE CASES  
IV. TECHNOLOGY ENABLERS FOR 6G WIRELESS SYSTEMS  
V. SYSTEM MODELS  
VI. LOCALIZATION KPIS  
VII. LOCALIZATION ALGORITHMS  
VIII. OPTIMIZATION FRAMEWORKS FOR LOCALIZATION  
IX. INSIGHTS & FUTURE DIRECTIONS  
X. CONCLUSION  