1. INTRODUCTION  
1.1 Scope  
1.2 Related surveys  
1.3 Structure of the survey  

2. OVERVIEW OF THE LITERATURE  

3. INTENT DETECTION  
3.1 Major areas of research  
3.2 Overview of technological approaches  

4. SLOT FILLING  
4.1 Major areas of research  
4.2 Overview of technological approaches  

5. JOINT INTENT AND SLOT MODELS  
5.1 Major areas of research  
5.2 Overview of technological approaches  

6. DATA SETS  
6.1 Introduction  
6.2 The Air Travel Information System (ATIS)  
6.3 SNIPS  
6.4 Other data sets  
6.5 Discussion  

7. EVALUATION METRICS  
7.1 Intent classification  
7.2 Error rate  
7.3 Slot labelling evaluation  
7.4 Semantic accuracy  
7.5 Other accuracy measures  
7.6 Qualitative evaluation  

8. EXPERIMENTAL SETUP  

9. PERFORMANCE SUMMARY  

10. CRITICAL DISCUSSION AND CONCLUSIONS