Documentation for JIRA 4.3. Documentation for other versions of JIRA is available too. 
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The 'Pie Chart' gadget displays issues returned from a specified project or issue filter, grouped by a specified field. For example, an issue filter can be created to retrieve all open issues for a particular version of a particular project. The 'Pie Chart' gadget can then be used to display these issues grouped by a specified field (e.g. Assignee).
The 'Pie Chart' gadget will appear as follows on the dashboard:
Click any section of the chart to view the matching issues.
If you use Internet Explorer, you will need to configure your browser to be able to print pages with charts correctly: