1 Introduction
1.1 Test Set Accuracy vs. Meta-Information
1.2 Why is a Taxonomy Needed?
2 Survey Methodology
3 Meta-Information Taxonomy
3.1 Meta-Information Content
3.2 Meta-Information Modality
3.3 Meta-Information Interactivity
3.4 Meta-Information Timing
4 Discussion
4.1 Difficulty of Trust Calibration
4.2 Future Directions
5 Limitations
6 Conclusions