1 Introduction  
2 Related Work  
3 Notation and Background  
4 Quantifying Action Influences  
5 The Challenges to Assign Credit in Deep RL  
6 Methods to Assign Credit in Deep RL  
7 Evaluating Credit  
8 Closing, Discussion, and Open Challenges  
8.1 Summary  
8.2 Discussion and Open Challenges  
8.3 Conclusions