I'd add that the concept of the "story" and the fact that it needs a title of the format "As a <party> I need <functionality> because it add <some business valu

I'd add that the concept of the "story" and the fact that it needs a title of the format "As a <party> I need <functionality> because it add <some business value>." That practice is quite powerful. It continues to amaze me how many project managers are content starting and promising delivery of a project without a clear Definition of Done or any understanding how all this effort will add value to the company/product.