A R T I C L E I N F O  
A B S T R A C T  
1. Introduction  
2. Question-based User Preference Elicitation  
3. Multi-turn Conversational Strategies for CRSs  
4. Dialogue Understanding and Generation in CRSs  
5. Exploration-Exploitation Trade-offs  
6. Evaluation and User Simulation  
7. Conclusion  