I think the key challenge and the most interesting thing within the data is about providing the intuition. The intuition brings the data into value-added. While, in order to provide intuition, we need to know what is the background, what type of data should be collected, how to make a inner join within multi-source environment, what would be the proper method to clean the dataset, how to analyze, and what is the question that I might answer. Therefore, it is about a continued lifecycle, and this is always a challenge, but also at the same time, the most exciting part of this skill.