On 25 December 2020, I have given a keynote speech on XAI and its role in trustworthy decision-making. It was a great session in the context of the events: the 3rd International Conference on Unconventional Modelling, Simulation & Optimization – Soft Computing and Meta Heuristics (UMSO 2020), and the 17th International Symposium on Management Engineering (ISME 2020). All my thanks go to valuable friends from Japan and everybody enrolled in the session!