1 INTRODUCTION  
2 SOCIAL SPACES IN GROUP INTERACTION  
3 GENERIC SURVEY FRAMEWORK WITH POSSIBLE CONCERN AREAS  
4 RESEARCH CHRONOLOGY  
5 CAMERAS AND SENSORS FOR SCENE CAPTURE  
6 CATEGORIZATION OF METHODS/TECHNIQUES  
7 CATEGORIZATION OF DETECTION CAPABILITIES AND SCALE  
8 CATEGORIZATION OF EVALUATION METHODS  
9 APPLICATION AREAS  
10 LIMITATIONS, CHALLENGES AND FUTURE DIRECTIONS: A DISCUSSION  
11 CONCLUSIONS