Decomposing Work Items
One of the early conversations I have with most teams I work with is about decomposition. There is often just a high level of variation in size, complexity, and other aspects of work in progress. This makes it hard to project when things will complete, when we will be able to get to new things, and how much of in-progress work was essential vs. deferrable.
From its introduction I have used Richard Lawrence’s excellent How to Split a User Story flowchart.