Map relationship authoring
A team encounters quite a few challenges when transitioning from unstructured to structured writing. For my team, the struggles associated with learning DITA and following the DITA structure were minor compared with the challenges presented by corralling hundreds of individual topics into a logical hierarchy. The biggest challenge we faced was managing topic relationships.
In DITA, related topics can be managed either in the DITA topics themselves, or via DITAMAPs using relationship tables <reltable>.
Basics for XML editors
DITA maps collect and organize references to DITA topics to indicate the relationships among the topics. They can be used to identify the topics you want to include in a deliverable, and to create tables of contents and related links for the information.