What is the highest level in the hierarchy of User Stories?

The highest level in the hierarchy of User Stories is a Theme. Themes are broad objectives or strategic goals that provide a way to group multiple epics, user stories, and tasks under a common purpose. They are typically aligned with high-level business goals and help teams keep focus on the bigger picture while managing individual components of work.

Epic represents a larger body of work that can be broken down into smaller user stories, and these are more tactical in nature. User Stories themselves are concise descriptions of a specific feature or functionality from the perspective of the end-user, and tasks are even smaller components that detail the work necessary to implement a user story. Themes encompass epics, user stories, and tasks, making it the highest level of organization within this hierarchy.