1 INTRODUCTION  
2 EXISTING SURVEYS  
3 SELECTION CRITERIA  
4 BACKGROUND  
4.1 Machine Learning Overview  
4.2 Deep Learning Overview  
4.3 Sensors  
4.4 Sensor Fusion Techniques  
5 HUMAN ACTIVITY  
6 DATA SOURCE DEVICES IN HAR  
7 DATA  
8 CLASSIFICATION MODEL AND EVALUATION  
8.1 Deep Learning (DL) based methodologies  
8.2 Machine Learning (ML) based methodologies  
9 DISCUSSION  
10 FUTURE RESEARCH DIRECTION  
11 CONCLUSION