What advances have we seen with Explainable AI and what are the first use cases?

Explainable AI (XAI) is one of the next frontiers in AI, looking at creating a white box neural network that can explain how it got to an answer.

Questions: - If not now, how many years away are we from seeing XAI in use? - What advances have we seen with XAI? - What are the most important use cases for this technology?

https://hbr.org/2019/07/what-ai-driven-decision-making-looks-like