A work item is anything that is used to build and track work during any phase of a product's lifecycle, including high-level features (epics), detailed work items (stories and their individual tasks), issues raised by customers or members of your test team (defects), and issues that prevent team members from completing their assignments (impediments).
In general, work items live in backlogs (product, release, and sprint). As work items move into a smaller backlogs they should decrease in size, but also increase in detail. Work items are configurable and can have many different names. Their relationships (to each other) are defined by your organization's work breakdown structure.
Serena Agile On Demand uses epics, stories, tasks, and defects. In general, an epic is the largest work item. Epics should broken down into well-defined stories (which then contain specific tasks). Defects are like stories (in that they should be well-defined and that they may contain specific tasks). An impediment is the final work type. In general, impediments can be resolved quickly; should your organization need to create impediments that require actual work by actual team members, you should add a user story into a backlog that is used by the team that will do the work that is needed before the impediment can be removed.
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